CSPL SEMINAR THURSDAY FEBRUARY 25

[Susan K. Yale]

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The University of Michigan
Communications and Signal Processing Laboratory Seminar Series
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TITLE
"Circuits and Coding for Low Power Communications"

SPEAKER
Dr. Oliver M. Collins
Department of Electrical Engineering
University of Notre Dame

ABSTRACT
This talk first describes the circuit design and the preliminary
experimental results of a family of precision comparators which allows
level crossing times to characterize a communications signal (e.g., a high
frequency, narrow bandwidth IF). A comparator divides the continuous range
of an analog input signal into two regions and provides a digital output
indicating the region in which the signal is. This digital output must, by
definition, have an extremely short transition time. A comparator is thus
a slope amplifier, since a slowly varying input must produce a very
rapidly varying output. Noise in the amplifiers causes the output
transition to be jarred from its correct position, producing jitter in the
output.

The talk presents a circuit design for very low jitter comparators. One
of these comparators has been assembled; its performance is vastly superior
to conventional instrumentation. The immediate application of these devices
is to miniature, low power communications and navigation receivers; the
results, however, are easily adapted to general purpose wave form
digitization. Comparators requiring low jitter are, of course, key
components of more conventional analog to digital conversion systems, e.g.,
flash analog to digital converters are composed of an array of comparators
with different thresholds.

These comparators will be used in communications receivers processing short
messages, and the second, very different, part of the talk presents tight
upper and lower bounds on the performance of coding when the number of
information bits in a code word is small.

WHERE AND WHEN
Thursday, February 25, 1999
4:30 - 5:30 PM
1001 EECS

EVERYONE IS WELCOME TO ATTEND
More information on this seminar series is available at
http://www.eecs.umich.edu/systems/cspl.html

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Susan K. Yale sky...@eecs.umich.edu
(734)647-2045 fax(734)763-8041
4230 EECS Building, 1301 Beal Avenue
EECS Department, University of Michigan
Ann Arbor, MI 48109-2122