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"CONTINUOUS-TIME DIGITAL FILTERS AND OTHER MIXED-DOMAIN PROCESSORS"PROF. YANNIS TSIVIDISColumbia UniversityGerontology Auditorium (GER 124)Friday, February 11, 20053:00-4:00p.m.Abstract:---------The main part of this talk considers the mixing of two domains usually kept separate: the digital domain, and the continuous time domain. When a continuous-time analog signal is to be processed using conventional DSPs, it is first sampled and quantized. This introduces aliasing of both the signal and the quantization distortion. We propose to quantize, but not sample, the input signal, producing continuous-time binary signals which are processed directly using continuous-time digital hardware. This eliminates aliasing and results in much smaller in-band quantization error than is possible with conventional digital techniques. Preliminary experimental and simulation results support these claims. We then introduce other mixed-domain signal processors, including linear analog filters which use nonlinear signal decompositions and processors in which digital waveforms are processed directly with analog circuits. The emphasis of the talk is on principles, some of which may lead to practically important results whereas others may be interesting only from a conceptual viewpoint.Bio:-----Yannis Tsividis received the B.S. degree from the University of Minnesota, Minneapolis in 1972, and the M.S. and Ph.D. degrees from the University of California, Berkeley, in 1973 and 1976, respectively. Since 1976 he has been with the Department of Electrical Engineering, Columbia University, New York, where he currently holds the Charles Batchelor Memorial Chair. He has done extensive work in analog and mixed-signal MOS integrated circuits at the device, circuit, system, and computer simulation level, starting with the first fully-integrated MOS operational amplifier in 1975. A Fellow of the IEEE, Dr. Tsividis has received or co-received several research awards, including the 1984 Baker Prize Award for the best IEEE publication, the IEEE Circuits and Systems Society's Darlington (1987) and Guilllemin-Cauer (1998) Best Paper Awards, and the 2003 International Solid-State Circuits Conference L. Winner Outstanding Paper Award. He received Columbia's Presidential Award for Outstanding Teaching in 2003 and the IEEE Undergraduate Teaching Award in 2005.Host: Prof. John Choma, x04692 ***A reception will follow the seminar at 4:00p.m.

Location: Ethel Percy Andrus Gerontology Center (GER) - ontology Auditorium

Audiences: Everyone Is Invited

Contact: Rosine Sarafian