ICCCAS 2024 Invited Speaker

Xizhu Peng

University of Electronic Science and Technology of China, China

Biography: Xizhu Peng (Member, IEEE) received the bachelor’s degree from the Beijing University of Aeronautics and Astronautics (Beihang University), Beijing, China, in 2009, and the master’s and Ph.D. degrees from Yokohama National University, Yokohama, Japan, in 2012 and 2015, respectively. He joined the Imaging Sensing Technology Department, Sony Corporation, Japan, in 2015, as an Imaging Processing IC Engineer. In 2016, he joined the University of Electronic Science and Technology of China (UESTC), where he is currently a professor of the Mix Signal and SoC Design Center. His current research interests include digital-assisted high speed and high precision analog-to-digital converter (ADC) and artificial neural network.
Speech Title: A Power-Efficient Class AB OTA with Slew Rate Enhancement Technique
Abstract: This paper presents a power-efficient fully differential operational transconductance amplifier (OTA) with slew rate enhancement technique. The proposed design is a class AB two-stage OTA, where the first stage employs adaptive bias and the second stage utilizes push-pull operation to achieve high power efficiency. The source of the input pair in the first stage is driven by a wide swing flipped voltage follower (FVF), resulting in higher transconductance and a larger linear input range. By introducing additional gain paths, the swing at the input of the second stage is increased thus the slew rate of this OTA is enhanced. Additionally, our design employs complementary series MOS transistors as AC-coupling resistors at the input of the second stage, guaranteeing high impedance during slewing, effectively ensuring signal’s AC coupling through capacitors. Simulation results show an outstanding large-signal figure-of-merit (FOML) of 455V-1 for this OTA, significantly surpassing OTAs with conventional structures.