AMSV Distinguished Lecture by Prof. Qiang Li: "Inverter-based and Time-based Analog Techniques for Subthreshold ADCs"

The University Lecture on “Inverter-based and Time-based Analog Techniques for Subthreshold ADCs” will take place as follows:

Date: 6 December 2018 (Thursday)

Time: 10:00am - 12:00pm

Venue: N21-G013, Lecture Hall, Research Building, University of Macau


The speaker is:

Prof. Qiang Li, Professor, University of Electronics Science and Technology of China (UESTC)


The Lecture is:

Inverter-based and Time-based Analog Techniques for Subthreshold ADCs



Ultra-low voltage analog design is fundamentally driven by energy-efficient SoCs where analog and digital cores share the same supply voltage. Subthreshold ADCs suffer from the limited voltage headroom which leaves little space for conventional analog techniques to enhance performance and efficiency. This talk discusses circuit-level approaches with inverter-based amplifiers and system-level approaches with time-based comparison. An evolution process of implementing conventional structures with inverters is introduced, allowing ultra-low voltage operation with increased flexibility in adopting traditional circuit techniques. Based on the proposed inverter-based elementary structure and CMFB, both the Miller-compensated (MC) OTA and the feedforward-compensated (FFC) OTA achieve significantly improved performance as compared to previous works. The amplifier techniques are verified in 0.3V DT and CT ΔƩ modulators in a 0.13μm CMOS. The number of oscillation cycles (NOC) to reach a VCO-comparator decision is investigated, which is found an inherent coarse quantization in parallel with the normal comparison. The NOC can be exploited for higher power efficiency and PVT robustness of VCO-based SAR ADCs.



Qiang Li received the B.Eng. in Electrical Engineering from the Huazhong University of Science and Technology (HUST), Wuhan, China and the Ph.D. in Electrical and Electronic Engineering from the Nanyang Technological University (NTU), Singapore, in 2001 and 2007, respectively. Since 2001, he has been working on analog/RF circuits in both academia and industry, holding positions of Engineer, Project Leader and Technical Consultant in Singapore, and Associate Professor in Denmark. He is currently a full Professor at the University of Electronic Science and Technology of China (UESTC), heading the Institute of Integrated Circuits and Systems. His research interests include low-voltage and low-power analog/RF circuits, data converters, and mixed-mode circuits for biomedical and sensor interfaces. Dr. Li was a recipient of the Young Changjiang Scholar award in 2015, the National Top-Notch Young Professionals award in 2013 and the UESTC Teaching Excellence award in 2011. He serves on the Student Research Preview (SRP) committee of ISSCC and the Technical Program Committee of ESSCIRC. He is the Founding Chair of IEEE SSCS/CASS Chengdu Chapter.


For more details, kindly find the event poster, abstract and bio.