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2011 | OriginalPaper | Buchkapitel

Comparator-Based Switched-Capacitor Delta-Sigma A/D Converters

verfasst von : Koen Cornelissens, Michiel Steyaert

Erschienen in: Analog Circuit Design

Verlag: Springer Netherlands

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Abstract

In comparator-based switched-capacitor circuits, OTAs are replaced by comparators and current sources. Instead of an OTA forcing a virtual ground condition, a comparator steers current sources until it detects a virtual ground. Different possibilities to use this principle in a ΔΣ A/D converter are evaluated. A pseudo-differential implementation with preset minimizes the requirements for the comparator and the current source. Due to the operation of the circuit, feed-back noise-shaping filters with half delay integrators are preferable. An implementation of a comparator-based switched-capacitor ΔΣ A/D converter in a 1 V, 90 nm CMOS technology demonstrates the feasibility.

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Metadaten
Titel
Comparator-Based Switched-Capacitor Delta-Sigma A/D Converters
verfasst von
Koen Cornelissens
Michiel Steyaert
Copyright-Jahr
2011
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-007-0391-9_9

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