Comet Calendar Event Details

GS/s ADC Based Cycle-to-Cycle Closed-Loop Adaptive Smart Driver for High-Performance SiC/GaN Power Devices by Prof. Ping Gui (Southern Methodist University)
Friday, Aug. 23
1 p.m. - 2 p.m. Location: ECSS 3.503

Abstract:

The power density of power converters is pushed to unprecedented levels for many emerging applications including automotive and industrial systems. Silicon-Carbide (SiC) and Gallium-Nitride (GaN) devices are attractive alternatives because of their high switching power and small figure of merit (Qg×RON) for the same breakdown voltage. However, the design of the gate drivers for these high-performance devices requires a tradeoff between electromagnetic interferences (EMI) and power efficiency. We propose a smart gate driver capable of evaluating and minimizing the EMI on a cycle-to-cycle base while maximizing the power efficiency.  For switching converters, Gaussian switching is theoretically proven as an ideal switching method capable of eliminating the EMI in the high- frequency domain. We propose implementing the first Gaussian switch driver on chip to realize a precise Gaussian trajectory tracking assisted with a high-speed ADC monitoring the voltages at the switching node. Additionally, dithering compression techniques are also applied to reduce EMI over the low-frequency domain. The proposed approaches provide a full-band solution to reduce EMI levels across the entire frequency domain without compromising the power efficiency.  Simulation results have shown that the Gaussian switching technique alone can achieve up to 20dB EMI reduction over the International Special Committee on Radio Interference (CISPR)-25 band. With the dithering compression technique, the proposed driver achieves an additional 10dB EMI noise compression. The proposed driver IC has been implemented in a 0.18um HV BCD process, with an input range from10V to 40V and producing a minimum output voltage of 1.2V with maximum output current of 2A at 10MHz switching frequency.

Bio:

Dr. Ping Gui is a Full Professor of Electrical and Computer Engineering at Southern Methodist University (SMU), Dallas, TX. She is the founder and director of the Integrated Circuits and Systems Lab at SMU. Her research interests include analog, mixed-signal and RF integrated circuit design for a variety of applications, including high-speed Analog-to-Digital Converters (ADC), power converters, high-speed data links for harsh environment, low-power circuitry for biomedical applications, etc. Dr. Gui is an author/co-author of over 110 peer-reviewed journal and conference articles. She is a recipient of Scientific Associate Award from CERN (European Organization of Nuclear Science) (2008-2011), SMU Ford Research Fellowship Award (2015), and co-author of Best Student Paper Finalist at IEEE RFIC 2017. Dr. Gui is a senior member of IEEE and has been serving on the Technical Program Committee of the IEEE Radio-Frequency Integrated Circuits (RFIC) Symposium (2015 – present) and IEEE Custom Integrated Circuits Conference (CICC) (2017 – present).

Contact Info:
Donna Kuchinski, 972-883-5556
Questions? Email me.

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