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John Choma

John Choma , Ph.D. - Professor
Research Interests:

Research continues in the general areas of the analysis, modeling, and design of high performance analog and mixed signal integrated circuits. Of recent particular interest is research into radio frequency (RF) integrated circuits in both deep submicron CMOS and heterostructure silicon-germanium bipolar transistors. These research thrusts embrace such circuits as RF front ends using inductive degeneration for impedance matching, match-terminated feedback amplifiers, voltage-controlled oscillators featuring ultralinear frequency versus voltage characteristics, passive and active monolithic filters, mixers, and phase-locked loops.

Recently, research has initiated to investigate the practicality of adaptive and even reconfigurable high performance analog integrated circuits. In this mixed signal work, an on chip digital control unit is used to (1) monitor the key performance metrics of a presumably well-designed integrated circuit, (2) store the desired values of the critical performance metrics, (3) compare monitored with stored characteristics, and (4) automatically adjust biasing and other circuit variables to achieve an optimal match between desired and actual performance. The approach is believed to show promise for automated test and assessment of analog integrated circuits.

Biographical Information:

Ph.D. in Electrical Engineering, 1969, U. of Pittsburgh, PA.

John Choma earned his B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Pittsburgh in 1963, 1965, and 1969, respectively. He is Professor and Chair of Electrical Engineering-Electrophysics at the University of Southern California, where he teaches undergraduate and graduate courses in electrical circuit theory, filters, and analog integrated electronics. Prof. Choma consults in the areas of broadband analog and high-speed digital integrated circuit analysis, design, and modeling.

Prior to joining the USC faculty in 1980, Prof. Choma was a senior staff design engineer in the TRW Microelectronics Center in Redondo Beach, California. His earlier positions include technical staff at Hewlett-Packard Company in Santa Clara, California, Senior Lecturer in the Graduate Division of the Department of Electrical Engineering of the California Institute of Technology, lectureships at the University of Santa Clara and the University of California at Los Angeles, and a faculty appointment at the University of Pennsylvania.

Prof. Choma, the author or co-author of some 150 journal and conference papers and the presenter of more than sixty invited short courses, seminars, and tutorials, is the 1994 recipient of the Prize Paper Award from the IEEE Microwave Theory and Techniques Society. He is the author of a Wiley Interscience text on electrical network theory and a forthcoming text on integrated circuit design for communication system applications. Prof. Choma has contributed several chapters to five edited electronic circuit texts, and he was an area editor of the IEEE/CRC Press Handbook of Circuits and Filters.

Prof. Choma has served the IEEE Circuits and Systems Society as a member of its Board of Governors, its Vice President for Administration, and its President. He has been an Associate Editor and Editor–In–Chief of the IEEE Transactions on Circuits and Systems, Part II. He is an Associate Editor of the Journal of Analog Integrated Circuits and Signal Processing and a former Regional Editor of the Journal of Circuits, Systems, and Computers.

A Fellow of the IEEE, Prof. Choma has been awarded the IEEE Millennium medal and has received three awards from the IEEE Circuits and Systems Society namely, the Golden Jubilee Award, the 1999 Education Award, and the 2000 Meritorious Service Award. He is also the recipient of several local and national teaching awards. Prof. Choma is a “Distinguished Lecturer” in the IEEE Circuits and Systems Society.

Research Areas: