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Code noise in delta-sigma modulators

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1 Author(s)
Lindquist, Claude S. ; Dept. of Electr. & Comput. Eng., Miami Univ., Coral Gables, FL, USA

A unique kind of noise appears in pulse density modulated (PDM) signals generated by 1-bit delta-sigma type A/D converters. We choose to call this "code noise." It is due to the limited number of codes used to characterize the input below 20% and above 80% of full-scale. The mathematical basis is derived and the resulting noise plotted for a variety of word lengths.

Published in:

Signals, Systems & Computers, 1998. Conference Record of the Thirty-Second Asilomar Conference on  (Volume:2 )

Date of Conference:

1-4 Nov. 1998