dunc@eecg.toronto.edu (Duncan Elliott) (08/05/89)
Electrical Engineering Computer Group
Cider Seminar Series
Sigma-Delta Converters
by
Richard Schreier
Electrical Engineering Electronics Group
University of Toronto
Time: Friday, Aug. 11, 1989, 12:05 --- Place: GB 220
In academia they are called Sigma-Delta converters. In audio
land, they are known as oversampled converters. What they are is a
nifty way to build both DACs and ADCs and are presently the best bet
for achieving the 18-bit linearity expected by digital audio. At
the heart of a sigma-delta converter is a coarse converter, operated
many times faster than the Nyquist rate, and a very good low-pass
filter. The structure of the converter is such that the
quantization noise gets reduced in the band of interest. One of the
amazing things about these converters is that this configuration
yields a low sensitivity to analog component errors. Another is
that the converter is inherently linear.
In this talk I will analyze a simple sigma-delta modulator,
show how to synthesize, in theory, a converter of any order, and
then present some results from my work.
Questions will be heartily welcomed. Answers even more so.
--
Duncan Elliott, Dept. EE, University of Toronto, Toronto, Canada M5S 1A5
dunc@eecg.toronto.edu dunc@eecg.utoronto.ca uunet!utai!eecg!dunc
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