Gastvortrag im Rahmen des Graduiertenkollegs - Time Encoding Techniques in Data Conversion

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Prof. Dr. L. Hernández, Carlos III University, Madrid, Spain

Time Encoding Techniques in Data Conversion

This talk addresses the data converter architectures that have been developed in the past years to overcome the implementation problems of analog electronics in nanometer technologies. One of the advantages of nanometer technologies is that digital logic is very fast due to the process scaling, allowing clock frequencies well in the GHz range. This permits to exchange amplitude resolution by time resolution to overcome the poor performance of analog circuits. A straightforward approach is to directly encode the analog signal using a PWM modulator and use a Time to Digital Converter to measure pulse widths. To overcome the nonlinearity of Time to Digital and Digital to Time circuits, another possible approach is to replace the coarse ADC and DAC’s of a continuous time sigma delta modulator by some kind of time based quantizer such as a VCO constructed with a ring oscillator or a Pulse Width modulator. These techniques have also opened a more general use of time encoding in signal processing. Theoretically, time encoding may permit to implement linear functions such as filters or conventional Nyquist converters operating upon time encoded sequences of samples. The talk deals about the theoretical principles and special architectures that have been developed to implement data converters using this amplitude to time transformation, showing the experimental results of several chips in 0.35u, 0.12u and 65nm CMOS. Speaker Biography:

Luis Hernandez (M’98) received the M.S. and Ph.D. degrees in telecommunication engineering from the Polytechnic University of Madrid, Spain, in 1990 and 1995. From 1996 to 1997, he was a research associate at Oregon State University, Corvallis, where his research focused on sigma-delta data converters. In 1997, he joined the Electronics Department of Carlos III University in Madrid, where he is currently Department Head and Associate Professor. His research interests are low pass and band pass sigma delta modulators, mismatch shaping algorithms and circuits and systems theory. He has coauthored 20 journal papers, more than 50 publications and holds 13 Patents. He is member of the Analog Signal Processing Technical Committee (ASPTC) and regularly contributes to the ESSCIRC Technical Program Committee.

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