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74dB SNDR multi-loop sturdy-MASH delta-sigma modulator using 35dB opamp gain

Title74dB SNDR multi-loop sturdy-MASH delta-sigma modulator using 35dB opamp gain
Publication TypeConference Paper
Year of Publication2008
AuthorsMaghari, N., S. Kwon, and U. Moon
Conference NameIEEE Custom Integrated Circuits Conference - CICC 2008
Pagination101 - 104
Date Published09/2008
PublisherIEEE
Conference LocationSan Jose, CA
ISBN Number978-1-4244-2018-6
Abstract

In this paper a new multi-loop delta-sigma modulator is presented. This multi-loop modulator is insensitive to low gain opamps while maintaining the stability advantage. As a proof of concept, a prototype was implemented to show the functionality of this structure. Measurement results shows that with open-loop opamp gain of only 35 dB, this prototype achieves over 74 dB SNDR at oversampling ratio of 16. The sampling frequency is 20 MHz and the total power dissipation is 3.2 mW from a 1.2 V power supply.

DOI10.1109/CICC.2008.4672031