Event - 13 March 2024

High-Voltage ICs in Silicon and GaN

Lectured by Prof. Bernhard Wicht (Institute of Microelectronic Systems, Leibniz University Hannover)


This talk presents research on miniaturized power supplies using high-voltage IC technologies that run from the 110/230V mains supply or high-voltage DC sources of more than 400V to power various low-voltage subsystems. A system and circuit-level overview of integrated chip-scale power supplies is given, supporting the miniaturization and decentralization of increasingly complex systems like sensor nodes, transceivers, and actuators with supply voltages of 3-10V at power levels of 500mW and below. Monolithic GaN integration combines voltage capabilities of up to 650V with faster and more efficient switching, leading to higher power levels and more compact solutions. Similar to their silicon counterparts, a GaN power stage can be combined with sensing and control loop circuits. However, monolithic GaN technology is less mature than silicon CMOS in various aspects like component set and analog performance. The talk presents two GaN IC designs, an offline LED driver with closed-loop control, and a fully integrated 500V, 6.25MHz GaN-IC for Totem-Pole PFC Off-Line Power Conversion.

Bio : Bernhard Wicht has 20+ years of experience in analog and power management IC design. He received the Dipl.-Ing. degree from TU Dresden in 1996 and the Ph.D. (Summa Cum Laude) from TU Munich in 2002. Between 2003 and 2010, he was with Texas Instruments in Germany, responsible for the design of automotive power management ICs. He was a professor at Reutlingen University and is currently the head of the Chair for Mixed-Signal IC Design at Leibniz University Hannover, Germany. His research interests include power management IC design, gate drivers, and high-voltage ICs. Dr. Wicht was co-recipient of the 2015 ESSCIRC Best Paper Award and the 2019 First Prize Paper Award of the IEEE Journal of Emerging and Selected Topics in Power Electronics. In 2018, he received the faculty award for excellent teaching at his university. He invented seventeen patents with several more pending. Dr. Wicht is a member of the Technical Program Committee of ISSCC, where he is currently the chair of the Power Management subcommittee. He was a Distinguished Lecturer of the IEEE Solid-State Circuits Society in 2020-2021. He was the General Chair of the International Workshop on Power Supply on Chip (PwrSoC) in 2023.


13/3/2024 10:30 - 11:30


ESAT Aula C, B91.300