Research Areas
Data converters; switched-capacitor circuits; analog and digital signal processing

Research Description
Communications, instrumentation, consumer electronics, etc. are all increasingly relying on digital signal processing (DSP) to carry out complex and time-consuming tasks. However, unavoidably, the input and output signals to all such systems had to remain analog, since signals encountered in nature are analog. Hence, interfaces are needed between the DSP core and the input/output terminals of all such systems, to process analog signals and to convert analog and digital signals into each other. With DSP technology exponentially improving in terms of speed, complexity and accuracy, the state of interface electronics has been left behind.

My research area, shared with my graduate students, encompasses many areas of interface electronics, including analog-to-digital and digital-to-analog converters, switched-capacitor filters and amplifiers, and sensor interfaces. We are heavily involved in the use of adaptive DSP methods within the interface itself, to achieve very high accuracy which is otherwise not practical in analog circuits.

Applications of Research
The described research is of great interest to leading integrated circuit companies, such as Analog Devices and National Semiconductor, which have been supporting our work for many years.

Recent Research Collaborations & Projects

1. "Radiation Hardening by Design for Data Converters," AFRL, $40,000, September 2003-August 2004
2. "High-Performance Delta-Sigma Converters," NSF-CDADIC, $60,000, September 1, 2003-August 31, 2004
3. "Research on Electronic Cytosensors," (with F. Chaplen, W. Kolodziej, U. Moon) Catalyst Foundation, $322,066, January 1, 2001-December 31, 2004
4. "Digitally Compensated Data Converters," (with U. Moon) Analog Devices Inc., $150,000, April 1, 2001-March 31, 2004
5. "Low-Voltage Microphone Interface Circuits," (with U. Moon) AKM, $105,000, March 1, 2002-August 31, 2003
6. "Nanocommunicator," (with T. Fiez, K. Mayaram, and U. Moon) DARPA, $100,000, June 28, 2002-October 28, 2006
7. "High-Performance Delta-Sigma Data Converters," NSF-CDADIC, $55,000, September 1, 2002-August 31, 2003
8. "Design of Rad-Hard Analog and Mixed-Signal Circuits in SOI Technology," AFRL, $76,000, September 16, 2002-August 15, 2003
9. "Low-Voltage Microphone Interface Circuits," (with U. Moon) AKM, April 1, 2002-August 31, 2003, $105,000
10. "Capacitor-Based High-Efficiency Voltage Regulator," (with U. Moon) National Semiconductor Corp, September 1, 2000-August 31, 2002, $130,000
11. "High-Performance Delta-Sigma converters," NSF-CDADIC, August 15, 2001 - August 15, 2002, $65,000
12. "Fast Opamp-Free Switched-Capacitor Circuits," (with U. Moon) NSF-CDADIC, August 15, 2001-August 15, 2002, $60,000
13. "US-Hungary Research on Switched Circuits in Digital CMOS Technology," NSF, July 15, 1996-June 30, 2002, $83,478
14. "Novel Techniques for Detection and Suppression of Mechanical Vibrations in Turbine Generators," (with W.J. Kolodziej) Catalyst Foundation, January 1, 1997-June 30, 2002, $185,217