OREGON STATE UNIVERSITY

You are here

A new zero-optimization scheme for noise-coupled ΔΣ ADCs

TitleA new zero-optimization scheme for noise-coupled ΔΣ ADCs
Publication TypeConference Paper
Year of Publication2010
AuthorsZanbaghi, R., T. S. Fiez, and G. C. Temes
Conference NameProceedings of 2010 IEEE International Symposium on Circuits and Systems
Pagination2163 - 2166
Date Published06/2010
PublisherIEEE
Conference LocationParis, France
ISBN Number978-1-4244-5308-5
Keywordsdelta-sigma modulator, loop filter, noise coupling, NTF, zero optimization
Abstract

This paper presents a new zero-optimization scheme for noise-coupled ΔΣ analog-to-digital converters (ADCs). The proposed technique enhances the signal-to-quantization-noise-ratio (SQNR) by optimizing noise-transfer-function (NTF) zero locations to get maximum in-band noise shaping. The amount of SQNR improvement using the new scheme depends on the order of the modulator. Therefore, zero optimization will be used in a first-order and a second-order modified noise-coupled ΔΣ ADCs. The proposed technique enhances the SQNR of the first-order and second-order noise-coupled ΔΣ modulators by 4.5dB and 8.5 dB, respectively.

DOI10.1109/ISCAS.2010.5537226