Research Areas
High-frequency switched-capacitor filters, low-voltage switched-capacitor circuits, high-resolution and oversampling data converters, and highly linear continuous-time filters.

Research Background/Applications
While much attention and publicity is given to the digital side of electronics chips (e.g. personal computer boom in the 80s with Intel microprocessors, digital audio, digital mobile phones, etc.), the real-world interfaces of all these systems, such as microphones, speakers, computer modems, wireless receivers/transmitters, etc., remain primarily analog. This is simply because the real-world is analog. This reality gives people like me a lot of interesting research topics to pursue. Some of the most popular and important work in this area revolves around data conversion (analog-to-digital and digital-to-analog converters). And recently, as the physical dimensions of transistors in ICs are getting smaller all the time, which means more functionality, faster processing, more memory, lower voltage supply (lower power), etc., this also means analog circuits will have to work properly under the lower voltage supply. This turns out to be a very challenging task, and this has been one of my main research thrusts here at Oregon State University.

After finishing my Ph.D. work at the University of Illinois Urbana-Champaign, I worked at Bell Labs for four years as an IC designer before joining Oregon State University in January of 1998. While at Bell Labs, I designed chips that went into high-speed telephone systems (e.g. T1/E1), digital subscriber lines (e.g. ADSL), and high-speed modem cards for computers. At Oregon State University, my research group has produced some pioneering work in low-voltage analog-to-digital data converters and digital compensation/correction techniques for analog circuits. I currently serve as a co-director of Center for Design of Analog-Digital Integrated Circuits (CDADIC).