@article{zhou_liang_huang_2010, title={A High-Dynamic Range Current Source Gate Driver for Switching-Loss Reduction of High-Side Switch in Buck Converter}, volume={25}, ISSN={["1941-0107"]}, DOI={10.1109/tpel.2009.2039649}, abstractNote={In this letter, a high-dynamic range current source gate driver (HD-CSD) circuit is proposed to reduce the switching loss of the high-side switch in buck converter with wide variation of the gate resistance. Hard switching loss is the major loss in high-side switch and limits the high switching-frequency application of dc-dc converter. Comparing with conventional voltage source gate driver (VSD) and the reported four switches CSD (4S-CSD), the proposed HD-CSD behaves more like the ideal current source driver which can realize the fast switching of power switches to reduce the switching loss. In addition, with proposed HD-CSD, impact of gate resistance that limits the switching speed of the power switch can be greatly reduced. Experimental results are presented to show the power efficiency improvement of buck converter with HD-CSD high-side driver comparing with VSD and 4S-CSD high-side drivers at switching frequency of 1 MHz.}, number={6}, journal={IEEE TRANSACTIONS ON POWER ELECTRONICS}, author={Zhou, Xin and Liang, Zhigang and Huang, Alex}, year={2010}, month={Jun}, pages={1439–1443} }
 @article{zhou_liang_huang_2010, title={A New Resonant Gate Driver for Switching Loss Reduction of High Side Switch in Buck Converter}, ISSN={["1048-2334"]}, DOI={10.1109/apec.2010.5433425}, abstractNote={In this paper, a new resonant gate driver circuits is proposed to reduce the switching loss of high side switch in buck converter. Hard switching causes major parts of the power loss in high side switch and limits high switching frequency application of DC-DC converter. The proposed resonant gate driver behaves more like the ideal current source driver which can fast turn-on/turn-off power switch to reduce switching loss. In addition, with proposed resonant gate driver, impact of parasitic gate resistance on switching speed of power switch can be greatly reduced. Test results show that, for buck converter with 12V input voltage, 1.3V output voltage, 10A load current and 5.5Ω gate resistance, comparing to conventional driver, with the proposed resonant gate driver for high side switch, total efficiency of buck converter can be improved by more than 3.5%.}, journal={2010 TWENTY-FIFTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC)}, author={Zhou, Xin and Liang, Zhigang and Huang, Alex}, year={2010}, pages={1477–1481} }
 @article{wang_zhou_park_guo_huang_2010, title={Analysis of Process-Dependent Maximal Switching Frequency, Choke Effect, and Its Relaxed Solution in High-Resolution DPWM}, volume={25}, ISSN={["1941-0107"]}, DOI={10.1109/tpel.2009.2025272}, abstractNote={This letter uses the fanout-of-4 (FO4) metric to analyze the semiconductor process (SP) dependent maximal switching frequency (MSF) of a digital pulsewidth modulator (DPWM). After discussing the choke effect in a self-oscillating hybrid (SOH) DPWM and its impact on MSF, this letter further shows that separating the voltage-controlled oscillator (VCO) and the delay mux line is an effective way to relax the choke effect so that the MSF in the SOH could be almost doubled, together with 10%-20% power saving. Taking a low-cost AMI06 SP and 9-bit-resolution specification as an example, this letter predicts that 8 MHz switching frequency could be achieved with the proposed SOH. The SOH chip was custom-designed and fabricated in a 0.703 mm2 die via the metal oxide semiconductor implementation service (MOSIS) educational program. The chip test demonstrated that the MSF is 7.4 MHz with 1.07 mA power consumption, and the adjustable switching frequency range is from 1.8 to 7.4 MHz.}, number={1}, journal={IEEE TRANSACTIONS ON POWER ELECTRONICS}, author={Wang, Xiaopeng and Zhou, Xin and Park, Jinseok and Guo, Rong and Huang, Alex Q.}, year={2010}, month={Jan}, pages={152–157} }
 @inproceedings{fan_zhou_yang_huang_2009, title={A low power high noise immunity boost DC-DC converter using the differential difference amplifiers}, DOI={10.1145/1594233.1594249}, abstractNote={A new boost converter using the differential difference amplifiers (DDAs) in the control loop is proposed. Compared with the traditional current mode boost converters, the circuitry of this controller is much simpler and consumes less power by eliminating the loop compensation, current sensing, and slope compensation circuits. A large duty ripple voltage generated by an Rr-Cr network is compared with the DDAs' outputs to get the duty cycles and changes the boost converter from a second order to a first order system. The large noise margin of the duty ripple voltage also gives this control excellent noise immunity performance.}, booktitle={ISLPED 09}, author={Fan, J. W. and Zhou, X. and Yang, L. Y. and Huang, A.}, year={2009}, pages={63–68} }
 @inproceedings{zhou_fan_huang_2009, title={Monolithic DC offset self-calibration method for adaptive on-time control buck converter}, DOI={10.1109/ecce.2009.5316520}, abstractNote={In this paper, a monolithic self-calibration method is proposed to reduce DC offset of output voltage in buck converter with adaptive on-time control. The calibration system senses the average output voltage of converter and dynamically reduces offset by digital tuning the comparing reference. DC offset at output voltage caused by parasitic ESR, ESL of filter capacitor and loop delay can be effectively calibrated. The proposed calibration method doesn't impact fast transient response of the converter. Moreover, the calibration system can also be generally used to reduce output voltage DC offset of converter with bang-bang control.}, booktitle={2009 IEEE Energy Conversion Congress and Exposition, Vols 1-6}, author={Zhou, X. and Fan, J. W. and Huang, A.}, year={2009}, pages={176–179} }