Academic Background

Wing-Hung Ki received the B.Sc. degree from the University of California, San Diego, in 1984, the M.Sc. degree from the California Institute of Technology, Pasadena, in 1985, and the Engineer degree and the Ph.D. degree from the University of California, Los Angeles, in 1990 and 1995, respectively, all in electrical engineering.

Ki joined Micro Linear Corporation, San Jose, CA, in 1992 as a Senior Design Engineer in the Department of Power and Battery Management, working on the design of power converter controllers. He then joined The Hong Kong University of Science and Technology in 1995, where he is now a Professor with the Department of Electronic and Computer Engineering. His research interests are power management circuits and systems, switch mode power converters, switched-capacitor power converters, low dropout regulators, bandgap references, micro-power energy harvesting circuits, RFID and micro-sensor circuits, and fundamental research in analog integrated circuit analysis and design.

Ki is serving on the International Technical Program Committee (ITPC) of the IEEE International Solid-State Circuit Conference (ISSCC, known as Chip Olympiad) since 2009; and served as an Associate Editor of the IEEE Transactions on Circuits and Systems II: Express Briefs (2004-2005). He was the recipient of the Asia Innovator Award (1998) granted by EDN Asia; the Outstanding Design Award (2004) and the Special Feature Award (2006) of the LSI University Design Contest organized by the Asia and South Pacific Design Automation Conference; the Best Paper Award of the IEEE International Symposium on Low Power Electronic Devices (2007) and the IEEE International Symposium on Integrated Circuits (2009); and the Student Paper Contest (First Prize) of the IEEE Int'l. Symp. on Circ. and Syst., (2011).

Awards

Teaching

UG courses taught:

PG courses taught:

PG self-financed courses taught:

Research

Research Interests

Research Laboratory

Postgraduate Students

Current PhD students

Current MPhil students

PhD Graduates

[D01]   Dongsheng Ma, Integrated Single-Inductor Multiple-Output and Adaptive DC-DC Conversion for Efficient Power Management, PhD Thesis, HKUST, July 2003.

[D02]   Yat-Hei Lam, Differential Common-Gate Techniques for High Performance Power Management Integrated Circuits, PhD Thesis, HKUST, Jan 14, 2008.

[D03]   Feng Su, Topology, Control and Implementation of Switched-Capacitor DC-DC Power Converters for Portable Applications, PhD Thesis, HKUST, Aug. 26, 2008.

[D04]   Jun Yi, Analysis, Modeling and Design of RF-DC Micro-Power Power Management Unit for RFID and Mirco-Sensor Applications, PhD Thesis, HKUST, Jan. 22, 2010.

[D05]   Chenchang Zhan, Analysis and Design of High-Performance CMOS Output- Capacitor-Free Low-Dropout Regulators for SoC, PhD Thesis, HKUST, Aug. 30, 2011.

[D06]   Yan Lu, Wireless Power Acquisition and Regulation: Power Management Integrated Circuits for Biomedical Implantable Devices, PhD Thesis, HKUST, Dec. 31, 2013.

[D07]   Yonggen Liu, Fast Load Transient Response and Chip Area Efficient Low Dropout Regulators, PhD Thesis, HKUST, Apr. 15, 2014.

MPhil Graduates

[M01]   Kin-Siu Fung, Analysis and Measurement of DCM Power Factor Correctors, MPhil Thesis, HKUST, Aug., 1998.

[M02]   Tsz-Kit Alex Ng, Lamp Modeling and Design of IC Controller for Dimmable Electronic Ballast, MPhil Thesis, HKUST, Aug., 1999.

[M03]   Sin-Luen Vincent Cheung, 1V Switched-Capacitor Pseudo-Two-Path Filter, MPhil Thesis, HKUST, Aug., 1999. (co-supervised with H. Luong).

[M04]   Hung-Shun Vincent Tam, Loop Gain Simulation and Measurement of PWM Switching Converters, MPhil Thesis, HKUST, Nov., 1999

[M05]   King-Fai Elson Yau, Phase-Controlled Dimmable CFL with PPFC and Switching Frequency Modulation, MPhil Thesis, HKUST, Aug., 2000.

[M06]   Wei Chen, Regulated Charge Pumps and Switching Low Drop-Out Regulators, MPhil Thesis, HKUST, Jan., 2001.

[M07]   Sang Lam, Design and Characterization of Silicon CMOS Devices for Radio-Frequency Integrated Circuits, MPhil Thesis, HKUST, Aug., 2001 (Supervisor: Mansun Chan).

[M08]   Tianrui Terrie Ying, Area Efficient Charge Pumps and Post Low Dropout Regulators, MPhil Thesis, HKUST, Oct., 2002.

[M09]   Chit-Sang Alvin Chan, Bi-Directional Integrated Charge Pump with Switching Low Dropout Regulator, MPhil Thesis, HKUST, Oct., 2002.

[M10]   Yeung-Kei Martin Chui, An Integrated Digital Controller for DC-DC Switching Converter with Dual-Band Switching, MPhil Thesis, HKUST, Dec., 2002.

[M11]   Zongqi Hu, Analog Integrated Circuit Design of Hypertrellis Decoders, MPhil Thesis, HKUST, Nov. 2003 (Supervisor: Wai-Ho Mow).

[M12]   Suet-Chui Gladys Koon, Integrated Charge-Control Single-Inductor Dual-Output Switching Converters, MPhil Thesis, HKUST, August 2004.

[M13]   Tsz-Fai Paulux Kwok, A Zero-ESR Stable Compensation Scheme for Low Dropout Regulators, MPhil Thesis, HKUST, Aug. 25, 2005.

[M14]   Wai-Yu Felix Wong, Supply-Independent Current-Mode Slew-Rate Enhancement Design, MPhil Thesis, HKUST, Jan. 24, 2006.

[M15]   Ngok-Man Arsenic Sze, Switching Converter Techniques for Energy Harvesting Applications, MPhil Thesis, HKUST, Aug. 23, 2007.

[M16]   Wing-Chun Chan, Supply and Temperature Compensated Oscillator for Super Twisted Nematic (STN) Application, MPhil Thesis, HKUST, Jan. 14, 2009.

[M17]   Ming-Yam Alvin Lo, Design and Implementation of Analog Continuous-Time Min-Sum Iterative Decoders, MPhil Thesis, HKUST, Aug. 24, 2010.

[M18]   Kwok-To Patrick Kwan, Freewheel Duration Optimization Schemes for Integrated Single-Inductor Multiple-Output Switching Converters, MPhil Thesis, HKUST, Aug. 24, 2010.

[M19]   King-Man Lai, Comparison and Implementation of High-Frequency Hysteretic Switching Converters, MPhil Thesis, HKUST, Aug. 2011.

Departmental Service

Publications & Presentations

• Journal Papers
• Conference Papers
• International Invited Tutorials
• Invited Talks
• Patents
• Books, Book Chapters

Journal Papers

Journal paper highlights (45):

[J01]    G. C. Temes and W. H. Ki, "Fast CMOS current amplifier and buffer stage," Elec. Lett., Vol. 23, pp. 696-697, June 1987.

[J02]    W. H. Ki and G. C. Temes, "Switched-capacitor modulator circuits," Elec. Lett., Vol. 25, pp. 379-380, March 1989.

[J03]    W. H. Ki and G. C. Temes, "Low-phase-error offset-compensated switched-capacitor integrator," Elec. Lett., Vol. 26, pp. 957-959, June 1990.

[J04]    J. F. Lin, W. H. Ki, K. Thompson, and S. Shamma, "Realization of cochlear filter by VLT switched-capacitor biquads," IEEE Trans. on Circ. and Syst., Part I, Vol. 41, No. 9, pp. 572-583, Sept. 1994.

[J05]    W. H. Ki and G. C. Temes, "Optimal capacitance assignment of switched-capacitor biquads", IEEE Trans. on Circ. and Syst., Part I, Vol. 42, No. 6, pp.334-342, June 1995.

[J06]    W. H. Ki, L. Der, and S. Lam, "Re-examination of pole-splitting of a generic single stage amplifier," IEEE Trans. on Circ. and Syst., Part I, Vol. 44, No. 1, pp.70-74, Jan. 1997.

[J07]    W. H. Ki, "Analysis of subharmonic oscillation of fixed frequency current-programming switching mode power converters," IEEE Trans. on Circ. & Syst., Part I, Vol. 45, No. 1, pp. 104-108, Jan. 1998.

[J08]    W. H. Ki, "Signal flow graph in loop gain analysis of DC-DC PWM CCM switching converters," IEEE Trans. on Circ. and Syst., Part I, Vol. 45, No. 6, pp. 644-655, June 1998.

[J09]    K. N. Leung, P.  Mok, W. H. Ki, and J. Sin, "Three-stage large capacitive load amplifier with damping-factor-control frequency compensation," IEEE J. of Solid-State Circ., Vol. 35, No. 2, pp. 221-230, Feb. 2000.

[J10]    W. H. Ki, "Signal flow graph analysis of feedback amplifiers," IEEE Trans. on Circ. and Syst., Part I, Vol. 47, No. 6, pp. 926-933, June 2000.

[J11]    V. Cheung, H. Luong and W. H. Ki, "A 1-V CMOS switched-opamp switched-capacitor pseudo-2-path filter," IEEE J. of Solid-State Circ., Vol. 36, No. 1, pp. 14-22, Jan. 2001.

[J12]    C. Xu, W. H. Ki and M. Chan, "A low voltage CMOS complementary active pixel sensor (CAPS) fabricated using a 0.25mm CMOS Technology," IEEE Electron Device Lett., Vol. 23, No. 7, pp. 398-400, July 2002.

[J13]    V. Cheung, H. Luong and W. H. Ki, "A 1-V 10.7-MHz switched-opamp bandpass sigma-delta modulator using double-sampling-finite-gain-compensation technique," IEEE J. of Solid-State Circ., Vol. 37, No. 10, pp. 1215-1225, Oct. 2002.

[J14]    C. Xu, W. Zhang, W. H. Ki and M. Chan, "A 1.0-V V_DD CMOS active-pixel sensor with complementary pixel architecture and pulsewidth modulation fabricated with a 0.25-mm CMOS process," IEEE J. of Solid-State Circ., Vol. 37, No. 12, pp. 1853-1859, Dec. 2002.

[J15]    D. Ma, W. H. Ki, C. Y. Tsui and P. Mok, "Single-inductor multiple-output switching converters with time-multiplexing control in discontinuous conduction mode," IEEE J. of Solid-State Circ., Vol. 38, No. 1, pp. 89-100, Jan. 2003.

[J16]    V. Cheung, H. Luong, M. Chan and W. H. Ki, "A 1-V 3.5-mW CMOS switched-opamp quadrature IF circuitry for bluetooth receivers," IEEE J. of Solid-State Circ., Vol. 38, No. 5, pp. 805-816, May 2003.

[J17]    S. Lam, P. Mok, W. H. Ki, P. Ko and M. Chan, "An enhanced compact waffle MOSFET with low drain capacitance from a standard submicron CMOS technology," Solid State Elec., Vol. 47, No. 5, pp. 785-789, May 2003.

[J18]    D. Ma, W. H. Ki and C. Y. Tsui, "A pseudo-CCM / DCM SIMO switching converter with freewheel switching," IEEE J. of Solid-State Circ., Vol. 38, No. 6, pp. 1007-1014, June 2003.

[J19]    T. R. Ying, W. H. Ki, and M. Chan, "Area-efficient CMOS charge pumps for LCD drivers," IEEE J. of Solid-State Circ., Vol. 38, No. 10, pp. 1721-1725, Oct. 2003.

[J20]    D. Ma, W. H. Ki and C. Y. Tsui, "An integrated one-cycle control buck converter with adaptive output and dual loops for output error correction," IEEE J. of Solid-State Circ., Vol. 39, No. 1, pp. 140-149, Jan. 2004.

[J21]    E. Au, W. H. Ki, W. H. Mow, S. Hung and C. Wong, "A novel current-mode sensing scheme for magnetic tunnel junction MRAM," IEEE Trans. on Magnetics, Vol. 40, No. 2, pp. 483-488, March 2004.

[J22]    E. Au, W. H. Ki, W. H. Mow, S. Hung and C. Wong, "A switched-current sensing architecture for a 4-state per cell magnetic tunnel junction MRAM," IEEE Trans. on Circ., and Syst., Part I, Vol. 51, No. 11, pp. 2113-2122, Nov. 2004.

[J23]    M. Chui, W. H. Ki, and C. Y. Tsui, "A programmable integrated digital controller for switching converters with dual-band switching and complex pole-zero compensation," IEEE J. of Solid-State Circ., Vol. 40, No. 3, pp. 772-780, March 2005.

[J24]    M. Siu, P. Mok, K. N. Leung, Y. H. Lam, and W. H. Ki, " A voltage-mode PWM buck regulator with end-point prediction", IEEE Trans. on Circ. and Syst., Part II, Vol. 53, No. 4, pp. 294-298, April 2006.

[J25]    Y. H. Lam,W. H. Ki and C. Y. Tsui, "Integrated low-loss CMOS active rectifier for wirelessly powered devices," IEEE Trans. on Circ. and Syst., Part II, Vol. 53, No. 12, pp. 1378-1382, Dec. 2006.

[J26]    J. Yi,W. H. Ki and C. Y. Tsui, "Analysis and design strategy of UHF micro-power CMOS rectifiers for micro-sensor and RFID applications," IEEE Trans. on Circ. and Syst., Part I, Vol. 54, No. 1, pp. 153-166, Jan. 2007.

[J26a]  J. Yi,W. H. Ki and C. Y. Tsui, "Corrections to 'Analysis and design strategy of UHF micro-power CMOS rectifiers for micro-sensor and RFID applications,'" IEEE Trans. on Circ. and Syst., Part I, Vol. 54, No. 6, pp. 1406, Jun. 2007.

[J27]    F. Su and W. H. Ki, "Design strategy for step-up charge pumps with variable integer conversion ratios," IEEE Trans. on Circ. and Syst., Part II, Vol. 54, No. 5, pp. 417-421, May 2007.

[J28]    D. Ma and W. H. Ki, "Fast-transient PCCM switching converter with freewheel switching control," IEEE Trans. on Circ. and Syst., Part II, Vol. 54, No. 9, pp. 825-829, Sept. 2007.

[J29]    F. Su, W. H. Ki and C. Y. Tsui,  "Ultra fast fixed frequency hysteretic buck converter with maximum charging current control and adaptive delay compensation for DVS applications," IEEE J. of Solid-State Circ., Vol. 43, No. 4, pp. 815-822, April 2008.

[J30]    F. Su and W. H. Ki, "Component-efficient multi-phase switched capacitor DC-DC converter with configurable conversion ratios for LCD driver applications," IEEE Trans. on Circ. and Syst., Part II, Vol. 55, No. 8, pp. 753-757, Aug. 2008.

[J31]    F. Su, W. H. Ki and C. Y. Tsui, "Regulated switched-capacitor doubler with interleaving control for continuous output regulation," IEEE J. of Solid-State Circ., Vol. 44, No. 4, pp. 1112-1120, Apr. 2009.

[J32]    H. Shao, C. Y. Tsui and W. H. Ki, "The design of a micro power management system for applications using photovoltaic cells with the maximum output power control," IEEE Trans. on VLSI Syst., Vol. 17, No. 8, pp. 1138-1142, Aug. 2009.

[J33]    Y. Y. Chan, D. Hui, A. R. Dickinson, D. Chu, D. Cheng, E. Cheung, W. H. Ki, W. H. Lau, J. Wong and E. Lo, "Engineering outreach: Initiative success with science and technology gifted students in Hong Kong," IEEE Trans. on Ed., Vol. 53, No. 1, pp. 158-171, Jan. 2010.

[J34]    C. Zhan and W. H. Ki, "Output-capacitor-free adaptively biased low-dropout regulator for system-on-chips," IEEE Trans. on Circ. and Syst., Part I, Vol. 57, No. 5, pp. 1017-1028, May 2010.

[J35]    Y. H. Lam and W. H. Ki, "CMOS bandgap references with self-biased symmetrically matched current-voltage mirror and extension of sub-1V design," IEEE Trans. on VLSI Syst., Vol. 18, No. 6, pp. 857-865, June 2010.

[J36]    J. Yin, J. Yi, M. K. Law, Y. Ling, M. C. Lee, K. P. Ng, B. Gao, H. C. Luong, A. Bermak, M. Chan, W. H. Ki, C. Y. Tsui, and M. Yuen, "A system-on-chip EPC Gen-2 passive UHF RFID tag with embedded temperature sensor," IEEE J. of Solid-State Circ., Vol. 45, No. 11, pp. 2404-2420, Nov. 2010.

[J37]    C. Zhan and W. H. Ki, "A low dropout regulator with low quiescent current and high power supply rejection over wide range of frequency for SoC," J. of Circ., Syst. and Comp., Vol. 20, No. 1, pp. 1-13, Jan. 2011.

[J38]    W. H. Ki, K. M. Lai, and C. Zhan, "Charge balance analysis and state transition analysis of hysteretic voltage mode switching converters," IEEE Trans. on Circ. and Syst., Part I, Vol. 50, No. 5, pp. 1142-1153, May 2011.

[J39]    C. Lu, C. Y. Tsui, W. H. Ki, "Micro power vibration energy scavenging system with maximum harvested power tracking for ubiquitous applications," IEEE Trans. on VLSI Syst., Vol. 19, No. 11, pp. 2109-2119, Nov. 2011.

[J40]    C. Zhan and W. H. Ki, "An output-capacitor-free adaptively biased low-dropout regulator with sub-threshold undershoot-reduction for SoC," IEEE Trans. on Circ. and Syst., Part I, Vol. 59, No. 5, pp. 1119-1131, May 2012.

[J41]    W. H. Ki, Y. Lu, F. Su, and C. Y. Tsui, "Analysis and design strategy of on-chip charge pumps for micro-power energy harvesting applications," in VLSI-SoC: Advanced Research for Systems on Chip, pp. 158-186, June 2012.

[J42]    C. Y. Tsui, X. Li and W. H. Ki, "Energy harvesting and power delivery for implantable medical devices," Foundations and Trends™ in Electronic Design Automation, Vol. 7, No. 3, pp. 179-246, 2013.

[J43]    Y. Lu, G. Yuan, L. Der, W. H. Ki and C. P. Yue, "A ±0.5% precision on-chip frequency reference with programmable switch array for crystal-less applications," IEEE Trans. on Circ. and Syst., Part II, Vol. 60, No. 10, pp. 642-646, Oct. 2013.

[J44]    C. Zhan and W. H. Ki, "Analysis and design of output-capacitor-free low-dropout regulators with low quiescent current and high power supply rejection," IEEE Trans. on Circ. and Syst., Part I, Vol. 61, No. 2, pp. 625-636, Feb. 2014. (One of the top 25 most frequently downloaded documents in Jan. 2014)

[J45]    Y. Lu and W. H. Ki, "A 13.56MHz CMOS active rectifier with switched-offset and compensated biasing for biomedical wireless power transfer systems," IEEE Trans. on Biomed. Circ. and Syst., Vol. 8, No. 3, pp. 334-344, June 2014.

[J46]    H. Shao, X. Li, C. Y. Tsui and W. H. Ki, "A novel single-inductor dual-input dual-output DC-DC converter with PWM control for solar energy harvesting system," IEEE Trans. on VLSI Syst., 2014, accepted for publication.

[J47]    L. Cheng, J. Ni, Y. Qian, M. Zhou, W. H. Ki, B. Liu, G. Li, Z. Hong, "On-chip compensated wide output range boost converter with fixed-frequency adaptive off-time control for LED driver applications," IEEE Tran. on Power Elec., 2014, accepted for publication.

Conference Papers

Conference paper highlights (17):

[C001]    W. H. Ki and G. C. Temes, "Offset-compensated switched-capacitor integrators," IEEE Int'l. Symp. on Circ. and Syst., pp. 2829-2832, 1990.

[C002]    W. H. Ki and G. C. Temes, "Gain- and offset-compensated switched-capacitor filters," Int'l. Symp. on Circ. and Syst., pp. 1561-1564, 1991.

[C003]    J. F. Lin, W. H. Ki, K. Thompson, and S. Shamma, "Realization of cochlear filter by VLT switched-capacitor biquads," IEEE Int'l Conf. of Acou., Speech, and Sig. Proc., pp. II.245-II.248, March, 1992.

[C004]    W. H. Ki and G. C. Temes, "Area-efficient gain- and offset-compensated very-large-time-constant SC biquads," IEEE Int'l. Symp. on Circ. and Syst., pp. 1187-1190, May 1992.

[C005]    J. F. Lin, W. H. Ki, K. Thompson, and S. Shamma, "Cochlear filters design using a parallel dilating-biquads switched-capacitor filter bank," IEEE Int'l Symp. on Circ. and Syst., pp.2053-2056, May 1992.

[C006]    J. Hwang, A. Chee, and W. H. Ki, "New universal control methods for power factor correction / DC-DC applications," IEEE Appl. Power Elec. Conf., pp. 59-65, Feb. 1997.

[C007]    Z. Li, P. Mok, W. H. Ki, and J. Sin, "A simple method to design resonant circuits of electronic ballast for fluorescent lamp," IEEE Int'l Symp. on Circ. and Syst., pp. 1744-1747, June 1997.

[C008]    K. N. Leung, P. Mok, W. H. Ki, and J. Sin, "Damping-factor-control frequency compensation technique for low-voltage low-power large capacitive load applications," IEEE Int'l Solid-State Circ. Conf., pp. 158-159, Feb. 1999.

[C009]    K. N. Leung, P. Mok, and W. H. Ki, "Optimum nested Miller compensation for low-voltage low-power CMOS amplifier," IEEE Int'l. Symp. on Circ. and Syst., pp. II.616-II.619, May 1999.

[C010]    K. N. Leung, P. Mok, and W. H. Ki, "A novel frequency compensation technique for low-voltage low-dropout regulator," IEEE Int'l. Symp. on Circ. and Syst., pp. V.102-V.105, May 1999.

[C011]    K. S. Fung, W. H. Ki and P. Mok, "Analysis and measurement of DCM power factor correctors," IEEE Power Elec. Specialists Conf., pp. 709-714, June 1999.

[C012]    W. H. Ki, J. Shi, E. Yau, P. Mok and J. Sin, "Phase-controlled dimmable electronic ballast for fluorescent lamps," IEEE Power Elec. Specialists Conf., pp. 1121-1125, June 1999.

[C013]    K. N. Leung, P. Mok, and W. H. Ki, "Right-half-plane zero removal technique for low-voltage low-power nested Miller compensation CMOS amplifiers," IEEE Int'l Conf. on Elec., Circ. and Syst., Paphos, Cyprus, pp.599-603, Sept.1999.

[C014]    V. Cheung, H. Luong and W. H. Ki, "A 1-V CMOS switched-opamp switched-capacitor pseudo-2-path filter," IEEE Int'l Solid-State Circ. Conf., San Francisco, USA, pp. 154-155+453, Feb. 2000.

[C015]    H. Lee, P. Mok, and W. H. Ki, "A novel voltage-control scheme for low-voltage DC-DC converters with fast transient recovery," IEEE Int'l. Symp. on Circ. and Syst., pp. I.256-I.259, May 2000.

[C016]    W. S. Chan, P. Mok, A. Ng, W. H. Ki, and J. Sin, "IC controller for dimmable electronic ballasts with closed-loop control," IEEE Int'l. Symp. on Circ. and Syst., pp. I.503-I.506, May 2000.

[C017]    K. N. Leung, P. Mok, W. H. Ki, and J. Sin, "Analysis on an alternative structure of damping-factor-control frequency compensation," IEEE Int'l. Symp. on Circ. and Syst., pp. II.545 - II.548, May 2000.

[C018]    A. Ng, W. H. Ki, P. Mok, and J. Sin, "Lamp modeling for design of dimmable electronic ballast," IEEE Power Elec. Specialists Conf., pp. 1358-1363, June 2000.

[C019]    D. Ma, W. H. Ki, C. Y. Tsui and P. Mok, "A single-inductor dual-output integrated DC/DC boost converter for variable voltage scheduling," IEEE/ACM Asia South Pacific Design Automation Conf., LSI University Design Contest, pp. 19-20, Jan. 2001.

[C020]    V. Cheung, H. C. Luong and W. H. Ki, "A 1-V 10.7-MHz switched-opamp bandpass sigma-delta modulator using double-sampling-finite-gain-compensation technique," IEEE Int'l Solid-State Circ. Conf., San Francisco, USA, pp. 52-53+428-429, Feb. 2001.

[C021]    W. Chen, W. H. Ki, P. Mok and M. S. Chan, "Switched-capacitor power converters with integrated low dropout regulators," IEEE Int'l. Symp. on Circ. and Syst., pp. III-293 - III-296, Sydney, May 2001.

[C022]    D.  Ma, W. H. Ki, P. Mok and C. Y. Tsui, "Single-inductor multiple-output switching converters with bipolar outputs", IEEE Int'l. Symp. on Circ. and Syst., pp. III-301 - III-304, Sydney, May 2001.

[C023]    D. Ma, W. H. Ki, C. Y. Tsui and P. Mok, "A 1.8V single-inductor dual-output switching converter for power reduction techniques," IEEE Symp. on VLSI Circ., Kyoto, Japan, pp. 137-140, June 2001.

[C024]    W. H. Ki and D. Ma, "Single-inductor multiple-output switching converters," IEEE Power Elec. Specialists Conf., Vancouver, Canada, pp. 226-231, June 2001.

[C025]    E. Yau, W. H. Ki, P. Mok and J. Sin, "Phase-controlled dimmable CFL with PPFC and switching frequency modulation," IEEE Power Elec. Specialists Conf., Vancouver, Canada, pp. 951-956, June 2001.

[C026]    W. Chen, W. H. Ki, P. Mok and M.S. Chan, "Dual-loop feedback for fast low dropout regulators," IEEE Power Elec. Specialists Conf., Vancouver, Canada, pp. 1265-1269, June 2001.

[C027]    S. Lam, W. H. Ki and M. Chan, "The silicon-on-sapphire technology for RF integrated circuits: potential and limitations," IEEE Region 10 Int'l Conf. on Electrical and Electronics Technology, Singapore, pp. 483-486, Aug. 2001.

[C028]    S. Lam, W. H. Ki, K. C. Kwok and M. Chan, "Realization of compact MOSFET structure by waffle-layout," European Solid-State Device Research Conf., Nuremberg, Germany, pp. 119-122, Sept. 2001.

[C029]    S. Lam, W. H. Ki and M. Chan, "Characteristics of RF power amplifiers by 0.5um SOS CMOS process," SOI Conf., Colorado, USA, pp. 141-142, Oct. 2001.

[C030]    D. Ma, W. H. Ki, and C. Y. Tsui, "A pseudo-CCM / DCM SIMO switching converter with freewheel switching," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 390-391+476. Feb. 2002.

[C031]    C. Xu, W. H. Ki and M. Chan, "A highly integrated CMOS image sensor architecture for low voltage applications with deep submicron process," IEEE Int'l. Symp. on Circ. and Syst., Scottsdale, USA, pp. III.699-III.702, May 2002.

[C032]    C. S. Chan, W. H. Ki and C.Y. Tsui, "Bi-directional integrated charge pumps," IEEE Int'l. Symp. on Circ. and Syst., Scottsdale, USA, pp. III.827-III.830, May 2002.

[C033]    T.R. Ying and W. H. Ki and M. Chan, "Area-efficient CMOS integrated charge pumps," IEEE Int'l. Symp. on Circ. & Syst., Scottsdale, USA, pp. III.831-III.834, May 2002.

[C034]    S. Lam, W. H. Ki and M. Chan, "High-isolation bonding pad with depletion-insulation structure for RF/microwave integrated circuits on bulk silicon CMOS," IEEE MTT-S Int'l Microwave Symp. Digest, Seattle, Washington, USA, pp. 677-680, June 2002.

[C035]    S. Lam, W. H. Ki, P. K. Ko and M. Chan, ''An enhanced compact waffle MOSFET for RF integrated circuits,'' Device Research Conf., Santa Barbara, CA, USA, pp. 73-74, June 2002.

[C036]    V. Cheung, H. Luong, M. Chan and W. H. Ki, "A 1-V 3.5-mW CMOS switched-opamp quadrature IF circuitry for bluetooth receivers," IEEE VLSI Symp. on Circ., pp. 140-143, June 2002.

[C037]    S. Lam, W. H. Ki, C. Shen, P. K. Ko and M. Chan, ''Evaluation of the partially-depleted silicon-on-sapphire technology for microwave amplifiers and other prospective applications,'' Int'l Conf. on Microwave and Millimeter Wave Technology, Beijing, pp. 171-174, Aug. 2002.

[C038]    D. Ma, W. H. Ki and C. Y. Tsui, "A fast response adaptive DC-DC switching converter using on-chip dual-loop one-cycle control," European Solid-State Circ. Conf., Firenze, Italy, pp. 379-382, Sept. 2002.

[C039]    Y. H. Lam, W. H. Ki, C. Y. Tsui and P. Mok, "Single-inductor dual-input dual-output switching converter for integrated battery charging and power regulation," IEEE Int'l. Symp. on Circ. and Syst., Bangkok, Thailand, pp. III.447-III.450, May 2003.

[C040]    L. F. Leung, C. Y. Tsui and W. H. Ki, "Simultaneous task allocation, scheduling and voltage assignment for multiple-processors-core systems using mixed integer nonlinear programming," IEEE Int'l. Symp. on Circ. and Syst., Bangkok, Thailand, pp. V.309-V.312, May 2003.

[C041]    Y. K. Chui, W. H. Ki and C. Y. Tsui, "An integrated digital controller for DC-DC switching converter with dual-band switching," IEEE VLSI Symp. on Circ., Kyoto, Japan, pp. 45-48, June 2003.

[C042]    Z. Q. Hu, W. H. Mow and W. H. Ki, "Analog integrated circuit design of a Hypertrellis decoder," Int'l Conf. on Parallel and Distributed Computing, Applications and Technologies, Chengdu, China, pp. 552-556, Aug. 2003.

[C043]    E. Au,W. H. Ki, W. H. Mow, S. Hung and C. Wong, "High-sensitivity switched-current sensing circuit for magnetic tunnel junction MRAM," IEEE Int'l Midwest Symp. on Circ. and Syst., Cairo, Egypt, pp. 269-271, Dec. 2003.

[C044]    D.  Ma, W. H. Ki and C. Y. Tsui, "Fast adaptive DC-DC conversion using dual-loop one-cycle control in standard digital CMOS process," Asia South Pacific Design Automation Conf., LSI University Design Contest, Yokohoma, Japan, pp. 539-540, Jan. 2004. (Outstanding Design Award)

[C045]    Y. K. Chui, W. H. Ki and C. Y. Tsui, "A dual-band switching digital controller for a buck converter," Asia South Pacific Design Automation Conf., Yokohoma, Japan, pp. 561-562, Jan. 2004.

[C046]    L. F. Leung, C. Y. Tsui and W. H. Ki, "Minimizing energy consumption of multiple-processor-core systems with simultaneous task allocation, scheduling and voltage assignment," Asia South Pacific Design Automation Conf., Yokohoma, Japan, pp. 647-652, Jan. 2004.

[C047]    L. F. Leung, C. Y. Tsui and W. H. Ki, "Minimizing energy consumption of hard real-time systems with simultaneous tasks scheduling and voltage assignment using statistical data," Asia South Pacific Design Automation Conf., Yokohoma, Japan, pp. 663-665, Jan. 2004.

[C048]    E. Au,W. H. Ki, W. H. Mow, S. Hung and C. Wong, "A binary-search switched-current sensing scheme for 4-state MRAM," ACM Great Lakes Symp. on VLSI, Boston, USA, pp. 304-307, Apr. 2004.

[C049]    H. Lam,W. H. Ki and D. Ma, "Loop gain analysis and development of high-speed high-accuracy current sensors for switching converters," IEEE Int'l. Symp. on Circ. and Syst., Vancouver, Canada, pp. V.828-V.831, May 2004.

[C050]    D. Ma, V. Tam, W. H. Ki and H. Lam, "A CAD simulator based on loop gain measurement for switching converters," IEEE Int'l. Symp. on Circ. and Syst., Vancouver, Canada, pp. V.940-V.943, May 2004.

[C051]    H. Lam,W. H. Ki, C. Y. Tsui and D. Ma, "Integrated 0.9V charge-control switching converter with self-biased current sensor," IEEE Int'l Midwest Symp. on Circ. and Syst., Hiroshima, Japan, pp. II.305-II.308, July 2004.

[C052]    W. H. Ki, F. Su and C. Y. Tsui, "Charge redistribution loss consideration in optimal charge pump design," IEEE Int'l. Symp. on Circ. and Syst., Kobe, Japan, pp. 1895-1898, May 2005.

[C053]    F. Su, W. H. Ki and C.Y. Tsui, "Gate control strategies for high efficiency charge pumps," IEEE Int'l. Symp. on Circ. and Syst., Kobe, Japan, pp. 1907-1910, May 2005.

[C054]    S. C. Koon, Y. H. Lam and W. H. Ki, "Integrated charge-control single-inductor dual-output step-up/step-down converter," IEEE Int'l. Symp. on Circ. and Syst., Kobe, Japan, pp. 3071-3074, May 2005.

[C055]    E. Au, W. H. Mow and W. H. Ki, "Hypergraph: an alternative graphical model for computing transfer functions in circuits and systems," IEEE Int'l Conf. on Comm. Circ. and Syst., Hong Kong, pp. 1353-1357, May 2005.

[C056]    C. Y. Tsui, H. Shao, W. H. Ki and F. Su, "Ultra-low voltage power management and computation methodology for energy harvesting applications," IEEE VLSI Symp. On Circ., Kyoto, Japan, pp. 316-319, June 2005.

[C057]    C. Y. Tsui, H. Shao, W. H. Ki and F. Su, "Ultra-low voltage power management and computation methodology for energy harvesting applications," Asia South Pacific Design Automation Conf., LSI University Design Contest, Yokohoma, Japan, pp. 96-97, Jan. 2006.

[C058]    Y. H. Lam, S. C. Koon, W. H. Ki and C. Y. Tsui, "Integrated direct output current control switching converter using symmetrically-matched self-biased current sensors," Asia South Pacific Design Automation Conf., LSI University Design Contest, Yokohoma, Japan, pp. 102-103, Jan. 2006.

[C059]    Y. H. Lam, W. H. Ki and C. Y. Tsui, "Adaptively-biased capacitor-less CMOS low dropout regulator with direct-current feedback," Asia South Pacific Design Automation Conf., LSI University Design Contest, Yokohoma, Japan, pp. 104-105, Jan. 2006. (Special Feature Award)

[C060]    F. Su, W. H. Ki and C. Y. Tsui, "High efficiency cross-coupled doubler with no reversion loss," IEEE Int'l. Symp. on Circ. and Syst., Koa, Greece, pp. 2761-2764, May 2006.

[C061]    H. Shao, C. Y. Tsui and W. H. Ki, "A novel charge based computation system and control strategy for energy harvesting applications," IEEE Int'l. Symp. on Circ. and Syst., Koa, Greece, pp. 2933-2936, May 2006.

[C062]    Y. H. Lam, W. H. Ki and C. Y. Tsui, "An integrated 1.8V to 3.3V regulated voltage doubler using active diodes and dual-loop voltage follower for switch-capacitive load," VLSI Symp. on Circ., Honolulu, USA, pp. 104-105, June 2006.

[C063]    C. Lu, C. Y. Tsui and W. H. Ki, "A batteryless vibration-based energy harvesting system for ultra low power ubiquitous applications," IEEE Int'l. Symp. on Circ. and Syst., New Orleans, USA, pp. 1349-1352, May 2007.

[C064]    H. Shao, C. Y. Tsui and W. H. Ki, "An inductor-less micro solar power management system design for energy harvesting applications," IEEE Int'l. Symp. on Circ. and Syst., New Orleans, USA, pp. 1353-1356, May 2007.

[C065]    F. Su, W. H. Ki and C. Y. Tsui "An ultra fast fixed frequency buck converter with maximum charging current control and adaptive delay compensation for DVS Applications," IEEE VLSI Symp. on Circ., pp. 28-29, June 2007.

[C066]    H. Shao, C. Y. Tsui and W. H. Ki, "A micro power management system and maximum output power control for solar energy harvesting applications," IEEE Int'l Symp. on Low Power Elec. Devices, pp. 298-303, Aug. 2007.

[C067]    C. Lu, C.Y. Tsui and W. H. Ki, "Vibration energy scavenging and management for ultra Low power applications," IEEE Int'l Symp. on Low Power Elec. and Design, pp. 316-321, Portland, USA, Aug. 2007. (Best Paper Award)

[C068]    T. F.  Kwok and W. H. Ki, "A stable compensation scheme for low dropout regulator in the absence of ESR," European Solid-State Circ. Conf., Munich, Germany, pp. 416-419, Sept. 2007.

[C069]    N. M. Sze, W. H. Ki and C. Y. Tsui, "Threshold voltage start-up boost converter for sub-mA applications," IEEE Int'l Symp. on Electronics Design, Test and Appl. (DELTA), Hong Kong, pp. 338-341, Jan. 2008. (Best Paper Award, Second Place)

[C070]    Y. H. Lam and W. H. Ki, "A 0.9V 0.35mm adaptively biased CMOS LDO with fast transient response," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 442-443+626, Feb. 2008.

[C071]    N. M. Sze, F. Su, Y. H. Lam, W. H. Ki and C. Y. Tsui, "Integrated single-inductor dual-input dual-output boost converter for energy harvesting applications," IEEE Int'l. Symp. on Circ. and Syst., Seattle, USA, pp.2218-2221, May 2008.

[C072]    J. Yi, F. Su, Y. H. Lam, W. H. Ki and C. Y. Tsui, "An energy-adaptive MPPT power management unit for micro-power vibration energy harvesting," IEEE Int'l. Symp. on Circ. and Syst., Seattle, USA, pp. 2570-2573, May 2008.

[C073]    F. Su, W. H. Ki and C. Y. Tsui, "An SC voltage regulator with novel area-efficient continuous output regulation by a dual-branch interleaving control scheme," IEEE VLSI Symp. on Circ., Honolulu, USA, pp. 136-137, June, 2008.

[C074]    F. Su and W. H. Ki, "An integrated reconfigurable SC power converter with hybrid gate control scheme for mobile display driver applications," IEEE Asian Solid-State Circ. Conf., Fukuoka, Japan, pp. 169-172, Nov. 2008.

[C075]    H. Shao, C. Y. Tsui and W. H. Ki, "An inductor-less MPPT design for light energy harvesting systems," Asia South Pacific Design Automation Conf., LSI University Design Contest, Yokohama, Japan, pp. 101-102, Jan. 2009.

[C076]    F. Su and W. H. Ki, "Digitally assisted quasi V² hysteretic buck converter with fixed frequency and without using large-ESR capacitor," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 446-447, Feb. 2009.

[C077]    Y. T. Wong, C. W. Ng, H. M. Wan, K. K. Kwong, Y. H. Lam and W. H. Ki, "Near-threshold startup integrated boost converter with slew rate enhanced error amplifier," IEEE Int'l. Symp. on Circ. and Syst., Taipei, Taiwan, pp. 2409-2412, May 2009.

[C078]    C. Zhan and W. H. Ki, "A high-precision low-voltage low dropout regulator for SoC with adaptive biasing," IEEE Int'l. Symp. on Circ. and Syst., Taipei, Taiwan, pp. 2521-2524, May 2009.

[C079]    J. Yi, W. H. Ki, P. Mok and C. Y. Tsui, "Dual-power-path RF-DC multi-output power management unit for RFID tags," IEEE VLSI Symp. on Circ., Kyoto, Japan, pp. 200-201, June 2009.

[C080]    H. Shao, C. Y. Tsui and W. H. Ki, "A single inductor dual input dual output DC-DC converter with hybrid supplies for solar energy harvesting applications," ACM/IEEE Int'l Symp. on Low Power Elec. and Design, pp.69-74, Aug. 2009.

[C081]    C. Zhan and W. H. Ki, "Loop bandwidth extension technique for PWM voltage mode switching converters," IEEE Asian Solid-State Circ. Conf., Taipei, Taiwan, pp. 325-328, Nov. 2009.

[C082]    C. Zhan and W. H. Ki, "A low dropout regulator for SoC with high power supply rejection and low quiescent current," IEEE Int'l Symp. on Int. Circ., Singapore, pp. 37-40, Dec. 2009. (Best Paper Award)

[C083]    M. Y.Lo, W. H. Ki and W. H. Mow, "A 20MHz switched-current input sample-and-hold circuit for current mode analog iterative decoders," IEEE Int'l Symp. on Int. Circ., Singapore, pp. 283-286, Dec. 2009.

[C084]    H. Shao, C. Y. Tsui and W. H. Ki, "Maximizing the harvested energy for micro-power applications through efficient MPPT and PMU design," IEEE Asia South Pacific Design Automation Conf., Taipei, pp. 75-80, Jan. 2010.

[C085]    J. Yin, J. Yi, M. K. Law, Y. Ling, M. C. Lee, K. P. Ng, B. Gao, H. Luong, A. Bermak, M. Chan, W. H. Ki, C. Y. Tsui, and M. Yuen, "A system-on-chip passive UHF RFID tag with embedded temperature sensor," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 308-309, Feb. 2010.

[C086]    K. T. Kwan and W. H. Ki, "Freewheel duration adjustment circuits for charge-control single-inductor dual-output switching converters," IEEE Int'l. Symp. on Circ. and Syst., Paris, pp. 2722-2725, May 2010.

[C087]    Y. Ling, J. Yi, C. Y. Tsui, and W. H. Ki, "System level power optimizations for EPC RFID tags to improve sensitivity using load power shaping and operation scheduling," IEEE Int'l. Symp. on Circ. and Syst., Paris, pp. 3012-3015, May 2010.

[C088]    H. Shao, C. Y. Tsui, and W. H. Ki, "A single inductor DIDO DC-DC converter for solar energy harvesting applications using band-band control," IEEE/IFIP VLSI-Syst. on Chip, Madrid, Spain, pp. 167-172, Sept. 2010.

[C089]    C. Zhan and W. H. Ki, "An output-capacitor-free cascode low-dropout regulator with low quiescent current and high power supply rejection," IEEE Asia Pacific Conf. on Circ. and Syst., Kuala Lumper, Malaysia, pp. 220-223, Dec. 2010.

[C090]    M. Y. Lo, W. H. Ki, and W. H. Mow, "A 25MHz sign and magnitude converter for analog current mode iterative decoders," IEEE Asia Pacific Conf. on Circ. and Syst., Kuala Lumper, Malaysia, pp. 472-475, Dec. 2010.

[C091]    C. Zhan and W. H. Ki, "Output-capacitor-free adaptively biased low-dropout regulators," IEEE Int'l Conf. on Electron Devices and Solid-State Circ., Hong Kong, China, Dec. 2010. (Student Paper Contest, Third Prize)

[C092]    C. Zhan and W. H. Ki, "An adaptively biased low-dropout regulator with transient enhancement," Asia and South Pacific Design Automation Conf., Yokohama, Japan, pp. 117-118, Jan. 2011.

[C093]    C. Zhan and W. H. Ki, "An output-capacitor-free adaptively biased low-dropout regulator with sub-threshold undershoot-reduction," IEEE Int'l. Symp. on Circ. and Syst., Rio de Janeiro, Brazil, pp. 45-48, May 2011. (Student Paper Contest: First Prize)

[C094]    Y. Lu, W. H. Ki, and J. Yi, "A 13.56MHz CMOS rectifier with switched-offset for reversion current control," IEEE VLSI Symp. on Circ., Kyoto, Japan, pp. 246-247, June 2011.

[C095]    W. H. Ki, Y. Lu, F. Su and C. Y. Tsui, "Design and analysis of on-chip charge pumps for micro-power energy harvesting applications," IFIP/IEEE VLSI-SoC, Hong Kong, pp. 374-379, Oct. 2011.

[C096]    X. Li, C. Y. Tsui and W. H. Ki, "A new charge pump analysis and efficiency optimization method for on-chip charge pump," IEEE Faible Tension Faible Consommation, Paris, France, June 2012.

[C097]    X. Li, C. Y. Tsui and W. H. Ki, "A solar energy harvesting system design based on a new adaptive charge pump," IEEE Faible Tension Faible Consommation, Paris, France, June 2012.

[C098]    Y. Lu, W. H. Ki, and C. P. Yue, "Input-adaptive dual-output power management unit for energy harvesting devices," IEEE Midwest Symp. on Circ. and Syst., Boise, Idaho, USA, pp. 1080-1083, Aug. 2012.

[C099]    Y. Liu, C. Zhan and W. H. Ki, "A fast-transient-response hybrid buck converter with automatic and nearly-seamless loop transition for portable applications," IEEE European Solid-State Circ. Conf., Bordeaux, France, pp. 165-168, Sept. 2012.

[C100]    Y. Liu, C. Zhan, L. Cheng and W. H. Ki, "A chip-area-efficient CMOS low-dropout regulator using wide-swing voltage buffer with parabolic adaptive biasing for portable applications," IEEE Asian Solid-State Circ. Conf., Kobe, Japan, pp. 233-236, Nov. 2012.

[C101]    K. M. Lai, C. Zhan and W. H. Ki, "A comparative study of hysteretic voltage-mode buck converters for high switching frequency and high accuracy," IEEE Asian Pacific Conf. on Circ. and Syst., Kaohsiung, Taiwan, pp. 57-60, Dec. 2012.

[C102]    Y. Liu, C. Zhan, L. Cheng and W. H. Ki, "A 10/30MHz PWM buck converter with an accuracy-improved ramp generator," IEEE Asian Pacific Conf. on Circ. and Syst., Kaohsiung, Taiwan, pp. 420-423, Dec. 2012.

[C103]    Y. Liu, C. Zhan, T. S. Yim and W. H. Ki, "Continuous-time common-mode feedback detector circuits with enhanced detection accuracy," IEEE Int'l Conf. on Electron Devices and Solid-State Circ., Bangkok, Thailand, Dec. 2012.

[C104]    Y. Lu, X. Li, W. H. Ki, C. Y. Tsui, and C. P. Yue, "A 13.56MHz fully integrated 1X/2X active rectifier with compensated bias current for inductively powered devices," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 66-67, Feb. 2013.

[C105]    M. Tan and W. H. Ki, "Current-mirror Miller compensation: an improved frequency compensation technique for two-stage amplifiers," IEEE Int’l Symp. on VLSI Design, Automation & Test (VLSI-DAT), Hsinchu, Taiwan, pp. 312-315, April 2013.

[C106]    C. Huang, L. Cheng, P. Mok and W. H. Ki, "High-side NMOS power switch and bootstrap driver for high-frequency fully-integrated converters with enhanced efficiency," IEEE Int'l. Symp. on Circ. and Syst., Beijing, China, pp. 693-696, May 2013.

[C107]    M. Tan and W. H. Ki, "Split-output Miller compensated two-stage amplifiers," IEEE Int’l Conf. on Elec. Devices and Solid-State Circ., Hong Kong, China, June 2013.

[C108]    K. M. Lau, H. W. Choi, W. H. Ki, S. W. R. Lee, P. K. T. Mok, J. K. O. Sin, and C. P. Yue, "Cost-effective and eco-friendly LED system-on-a-chip," China Solid-State Lighting, Beijing, China, Oct., 2013.

[C109]    L. Cheng, Y. Liu and W. H. Ki, "A 10/30MHz wide duty cycle range buck converter with DDA-based Type-III compensator and fast reference-tracking responses for DVS applications," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 84-85, Feb. 2014.

[C110]    Y. Lu, W. H. Ki and C. P. Yue, "A 0.65ns response time 3.01ps FOM fully-integrated low-dropout regulator with full-spectrum power-supply-rejection for wideband communication systems," IEEE Int'l Solid-State Circ. Conf., San Francisco, pp. 306-307, Feb. 2014.

[C111]    Y. Liu, C. Zhan and W. H. Ki, "Fast-transient-response high-PSR low-dropout regulator based on ultra-fast error amplifier and unity-gain buffer for portable applications," IEEE Int'l. Symp. on Circ. and Syst., Melbourne, Australia, pp. 906-909, June 2014.

[C112]    L. Cheng and W. H. Ki, "A circuit-oriented geometrical approach in predicting subharmonic oscillation of DC-DC converters with voltage-mode control," IEEE Int'l. Symp. on Circ. and Syst., Melbourne, Australia, pp. 962-965, June 2014.

[C113]    X. Li, Y. Lu, C. Y. Tsui, and W. H. Ki, "An adaptive wireless powering and data telemetry system for optic nerve stimulation," IEEE Int'l. Symp. on Circ. and Syst., Melbourne, Australia, pp. 1404-1407, June 2014.

[C114]    M. Tan, C. Zhan and W. H. Ki, "A 4μA quiescent current output-capacitor-free low-dropout regulator with fully differential input stage," IEEE Int'l. Symp. on Circ. and Syst., Melbourne, Australia, pp. 2457-2460, June 2014.

[C115]    Y. Wang, Y. Lu, Q. Pan, Z. Hou, L. Wu, W. H. Ki, and C. P. Yue, "A 3-mW 25-Gb/s CMOS transimpedance amplifier with fully integrated low-dropout regulator for 100GbE systems," IEEE RFIC Symp., Tampa Bay, Florida, USA, pp. 275-278, June, 2014.

[C116]    X. Li, C. Y. Tsui, and W. H. Ki, "A 13.56MHz wireless power transfer system with reconfigurable resonant regulating rectifier and wireless power control for implantable medical devices," IEEE VLSI Symp. on Circ., Honolulu, USA, pp. 23-24, June, 2014.

[C117]    Q. Pan, Z. Hou, Y. Wang, Y. Lu, W. H. Ki, K. C. Wang, and C. P. Yue, "A 48-mW 18-Gb/s fully integrated CMOS optical receiver with photodetector and adaptive equalizer," IEEE VLSI Symp. on Circ., Honolulu, USA, pp. 95-96, June, 2014.

[C118]    M. Tan, and W. H. Ki, "A fast transient output-capacitor-free low-dropout regulator with Class-AB control stage," IEEE Int'l Conf. on Electron Devices and Solid-State Circ., Chengdu, China, June 2014.

[C119]    Y. Liu, C. Zhan, J. Zheng and W. H. Ki, "Load-transient enhanced low-dropout regulator based on buffer stage with paralleled current and voltage paths for low-ESR applications," IEEE Int'l Conf. on Electron Devices and Solid-State Circ., Chengdu, China, June 2014.

[C120]    Q. Pan, Y. Wang, Z. Hou, L. Sun, Y. Lu, L. Wu, W. H. Ki, P. Chiang, and C. P. Yue, "A 41-mW 30-Gb/s CMOS optical receiver with digitally-tunable cascaded equalization," IEEE European Solid-State Circ. Conf., Venice, Italy, Sept. 2014, to appear.

International Invited Tutorials

[TU01]   W. H. Ki, "Circuit Design for Power Management Building Blocks," Short Course, IEEE VLSI Symposium on Circuits, Honolulu, USA, June 17, 2008. (1.25 hrs)

[TU02]   W. H. Ki, "Fundamentals of Voltage Reference," Education Session, IEEE Custom IC Conference, San Jose, USA, Sept. 21, 2008. (1.5 hrs)

[TU03]   W. H. Ki, "IC Building Blocks for DC-DC Converters," Tutorial, IEEE Asian Pacific Conference on Circuits and Systems, Macau, China, Nov. 30, 2008. (3 hrs)

[TU04]   W. H. Ki, "IC Design of Power Management Circuits," Tutorial, IEEE International Symposium on Integrated Circuits, Singapore, Dec. 14, 2009. (6 hrs)

[TU05]   W. H. Ki, "Power Management IC Design: Part I–Switching Converters; Part II – Charge Pumps," Tutorial, IEEE Radio-Frequency Integration Technology Symposium, Singapore, Nov. 21, 2012. (3 hrs)

[TU06]   W. H. Ki, "IC Building Blocks for DC-DC Converters," Tutorial, IEEE Asia Pacific Conference on Circuits and Systems, Kaohsiung, Taiwan, Dec. 2, 2012. (3 hrs)

[TU07]   W. H. Ki, "Design of Voltage References," Tutorial, IEEE International Conference on Solid-State Circuits, San Francisco, USA, Feb. 17, 2013. (1.25 hrs)

Invited Talks

[TK01]   W. H. Ki, "Power Factor Basics," IR μPFC^TM Technical Seminar, Shenzhen, June 9, 2006.

[TK02]   W. H. Ki, "Design Issues of Switching Converters," ADI Technology Forum, Sanya, Dec. 27, 2007.

[TK03]   W. H. Ki, "Development of Integrated Switched-Capacitor Power Converters," Joint University Workshop on Power Electronics, Hong Kong, Jan. 9, 2009.

[TK04]   W. H. Ki, "Small Signal Analysis of Switching Converters," Zhejiang University, Hangzhou, Sept. 25, 2009.

[TK05]   W. H. Ki, "Research Experience and Writing Papers," Zhejiang University, Hangzhou, China, Sept. 25, 2009.

[TK06]   W. H. Ki, "Development of Integrated Switched-Capacitor Power Converters," ADI Technology Conference, Shanghai, China, Sept. 26, 2009.

[TK07]   W. H. Ki, "Design and Considerations of Fast Transient Integrated Switching Converters," Institute of Microelectronics, Singapore, Dec. 15, 2009.

[TK08]   W. H. Ki, "Advanced Analog IC Design: Bandgap References," MEAD Education, Hong Kong, Jan. 8, 2010.

[TK09]   W. H. Ki, "Switching Converter IC Design," MEAD Education, Hong Kong, Jan. 13, 2011.

[TK10]   W. H. Ki, "Charge Pump IC Design," MEAD Education, Hong Kong, Jan. 15, 2011.

Patents

[P01]   W. H. Ki, "Current sensing technique using MOS transistors scaling with matched bipolar current sources", U.S. Patent 5,757,174, May 26, 1998.

[P02]   J. Hwang and W. H. Ki, "Input current modulation for power factor correction", U.S. Patent 5,804,950, Sept. 8, 1998.

[P03]   W. H. Ki, P. Mok, and J. Sin, "Dimmable electronic ballast with phase control", US Patent 6,172,466, Jan. 9, 2001.

[P04]   K. N. Leung, P. Mok, W. H. Ki, and J. Sin, "Frequency compensation techniques for low-power multistage amplifiers", US Patent 6,208,206, March 27, 2001.

[P05]   M. Chan, C. Xu and W. H. Ki, "Ultra low voltage CMOS image sensor architecture," US Patent 7,005,626, Feb 28, 2006.

[P06]   Y. H. Lam, W. H. Ki and C. Y. Tsui, "Symmetrically matched voltage mirrors and applications therefor," US Patent 7,215,187, May 8, 2007.

[P07]   Y. H. Lam, W. H. Ki and C. Y. Tsui, "Single-inductor multiple-input multiple-output switching converter and method of use," US Patent 7,256,568, Aug 14, 2007.

[P08]   W. H. Ki, F. Su, Y. H. Lam and C. Y. Tsui, "N-stage exponential charge pumps, charging stages therefor and methods of operation therefor," US Patent 7,397,299, July 8, 2008.

[P09]   D. Ma, W. H. Ki, and C. Y. Tsui, "Single-inductor multiple-output switching converters in PCCM with freewheel switching," US Patent 7,432,614, Oct. 7, 2008.

[P10]   W. H. Ki, F. Su, Y. H. Lam and C. Y. Tsui, "N-stage exponential charge pumps, charging stages therefor and methods of operation therefor," US Patent 7,605,640, Oct. 20, 2009.

[P11]   M. Chan, C. Xu and W. H. Ki, "Ultra low voltage CMOS image sensor architecture," US Patent 7,858,912, Dec. 28, 2010.

[P12]   M. Chan, C. Xu and W. H. Ki, "Ultra low voltage CMOS image sensor architecture," US Patent 7,897,901, Mar. 1, 2011.

[P13]   M. Y. Lo, W. H. Mow and W. H. Ki, "Analog iterative decoder with early-termination," US Patent 8,291,298, Oct. 16, 2012.

Books, Book Chapters

[B01]   W. H. Ki, Y. Lu, F. Su and C. Y. Tsui, "Analysis and design strategy of on-chip charge pumps for micro-power energy harvesting applications," in VLSI-SoC Advanced Research for Systems on Chip, pp. 158-186, Springer, 2012.

[B02]   C. Zhan and W. H. Ki, Output Capacitor Free Low Dropout Regulators: Analysis and Design, Lambert Academic Publishing, 2012.

[B03]   C. Y. Tsui, X. Li and W. H. Ki, Energy harvesting and power delivery for implantable medical devices, now Publisher Inc., 2013.

Opinions

From time to time, I'll add to this column my opinion on various topics, such as research, humanity, religion, philosophy, etc.. Comments are welcome.

• On Research Articles
• The Paradox of Truth
• On Studying
• On Paradoxes
• What is so special about 0123456789?

On Research Articles

A research article must be accurate in its claims, contains no erroneous results, and contradicts no established ones, best, to resolve contradictions if they do exist. It should exhibit elements of novelty, that it describes new direction of research, or that it proposes new method in solving existing problems. The objective should be clearly stated and should relate to prior efforts and solutions. Literature search has to be adequate if not exhaustive. The article should address why the proposed method is preferred. Arguments should be consistent and coherent, straightforward and uncomplicated, such that anyone in the field could follow easily. The article should not purport obscure results that are intractable. It should be concise and precise, that one finds it exceedingly difficult to be abridged without sacrificing clarity.

I do not suggest that my articles fulfill all the above criteria, but they are the standards that I have been working hard to achieve. I particularly hope that my students could follow the above guidelines in writing up their research articles.

Ki, July 13, 1998.

The Paradox on Truth

No one ever demonstrates that he or she possesses truth, and we are unable to establish an encompassing definition for truth. Even though we ever get hold of a piece of it, we are unable to tell that we have got it. In a sense, we are fathoming an indefinite target, although (most of us would not object that) truth should be eternal.

This paradox is implied by the philosophy of Karl Popper.

Remark: Much effort of humanity is devoted to the pursuit of truth. In the process of searching, we are of course shaping our view on truth. Yet it will be a tabulation of entities instead of a concise statement.

Ki, Aug 1, 1998.

On Studying

I would like to share my experience in studying for classes and research with you, and hope you would find it useful. In studying for classes, I put reading the text as the first priority, since a good text presents material in a logical order, and provides details and examples that one would find it easy to follow. The first time could be a cursory reading in grabbing main points rather than particulars. Then a detail study should follow. I will underline all important points in red. My criteria for underlining is that one should get all information needed by just reading the underlined parts, and I can assure you that less than 30% of any text would contain essential information. Class notes should also be studied. Since most class notes are sketchy, I will append all that has been missed out, especially derivations that are incomplete. When the examination arrives, I will have equipped myself with an abridged text and a detail notes, which would take less time to review. In studying for research, the same procedure applies. Research works are mostly incomplete, and I will add questions and comments at appropriate spots to remind myself of unresolved issues. Of course, there are articles that need not be read in detail, which can be screened out by personal judgment.

Ki, Aug 20, 1998.

On Paradoxes

(1) This statement is false.

Now, if we assume (1) is true, then the content of (1) dictates that (1) is false. If we assume (1) is false, then (1) is true!!

Many logicians suggest that the above paradox is due to self-referencing. Yet, I would argue that the problem of (1) is due to its meaninglessness. Let us consider a related example.

(1a) This statement is true.

In this case, we may conclude that (1a) is true. But in fact, we don't know what (1a) actually means. It is only a scrabble of words that is devoid of content. Let us consider yet another example.

(1b) It will rain on Jan. 1, 2000 and it will not rain on Jan. 1, 2000.

We know exactly what the sentence means, and conclude immediately that (1b) is a contradiction. Yet we cannot understand (1a) (and (1)) on the same ground. Since (1) is devoid of meaning, it fails to be a statement. The paradox is due to the fact that (1) is logically nonsensical.

(2) The liar paradox

Consider Epimenides, a Cretan, claims that all Cretans are liars. Is he telling the truth?

We have a paradox, if in fact, all Cretans are liars. This logical impossibility ensures that not all Cretans are liars, and Epimenides was lying on his claim.

For more of these logic puzzles and paradoxes, the readers may refer to "5000 B.C. and Other Philosophical Fantasies" by Raymond Smullyan. Many a time these examples are used in preliminary discussion of the Godel's Incompleteness Theorems.

Ki, Aug 25, 1998.

What is so special about 0123456789?

Observe the following:

0 123 456 789 x 01 = 0 123 456 789
0 123 456 789 x 02 = 0 246 913 578
0 123 456 789 x 04 = 0 493 827 156
0 123 456 789 x 05 = 0 617 283 945
0 123 456 789 x 07 = 0 864 197 523
0 123 456 789 x 08 = 0 987 654 312
0 123 456 789 x 10 = 1 234 567 890
0 123 456 789 x 11 = 1 358 024 679
0 123 456 789 x 13 = 1 604 938 257
0 123 456 789 x 14 = 1 728 395 046
0 123 456 789 x 16 = 1 975 308 624
0 123 456 789 x 17 = 2 098 765 413
0 123 456 789 x 20 = 2 469 135 780
0 123 456 789 x 22 = 2 176 049 358
0 123 456 789 x 23 = 2 839 506 147
0 123 456 789 x 25 = 3 086 419 725
0 123 456 789 x 26 = 3 209 876 514
0 123 456 789 x 31 = 3 827 160 459
0 123 456 789 x 32 = 3 950 617 248
0 123 456 789 x 34 = 4 197 530 826
0 123 456 789 x 35 = 4 320 987 615
0 123 456 789 x 40 = 4 938 271 560
0 123 456 789 x 41 = 5 061 728 349
0 123 456 789 x 43 = 5 308 641 927
0 123 456 789 x 44 = 5 432 098 716
0 123 456 789 x 50 = 6 172 839 450
0 123 456 789 x 52 = 6 419 753 028
0 123 456 789 x 53 = 6 543 209 817
0 123 456 789 x 61 = 7 530 864 129
0 123 456 789 x 62 = 7 654 320 918
0 123 456 789 x 70 = 8 641 975 230
0 123 456 789 x 71 = 8 765 432 019
0 123 456 789 x 80 = 9 876 543 120

The fact is that when 0123456789 is multiplied by an integer smaller than or equal to 80, many (33) of the products contain all the numerals in a scrabbled fashion, a total of 41%. This seems not to apply to other numbers.

Also,
987 654 321.0 x 1 = 0 987 654 321
987 654 321.0 x 2 = 1 975 308 642
987 654 321.0 x 4 = 3 950 617 284
987 654 321.0 x 5 = 4 938 271 605
987 654 321.0 x 7 = 6 913 580 247
987 654 321.0 x 8 = 7 901 234 568

Similar observation applies.

Ki, March 13, 1999.

Last update: Sep. 23, 2014