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N-path dynamic element matching for multibit bandpass ΣΔ modulators

✍ Scribed by Lindfors, Saska; Ööpik, Priit; Halonen, Kari

Book ID: 101224875
Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 238 KB
Volume: 25
Category: Article
ISSN: 0098-9886
DOI: 10.1002/(sici)1097-007x(199709/10)25:5<335::aid-cta977>3.0.co;2-0

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✦ Synopsis

We discuss different dynamic element-matching (DEM) techniques resulting in a noise-shaped mismatch spectrum. The frequency domain operation of data-weighted averaging (DWA), which results in first-order highpass mismatch noise shaping, is explained and the extension of DWA to a general mismatch noise-shaping transfer function is considered. An N-path DEM technique, which results in a simple implementation of bandstop mismatch noise shaping, is presented and compared with the case of bandstop shaping derived from general DWA. An implementation of the proposed N-path DEM for a bandpass sigma-delta modulator is presented with simulation results.

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