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A novel low power hybrid loop filter for continuous-time sigma-delta modulators

TitleA novel low power hybrid loop filter for continuous-time sigma-delta modulators
Publication TypeConference Paper
Year of Publication2009
AuthorsZanbaghi, R., and T. S. Fiez
Conference NameIEEE International Symposium on Circuits and Systems - ISCAS 2009
Pagination3114 - 3117
Date Published05/2009
PublisherIEEE
Conference LocationTaipei, Taiwan
ISBN Number978-1-4244-3827-3
Abstract

A novel low power hybrid (Active-Passive) loop filter using the single amplifier biquad (SAB) filter is presented. This new hybrid loop filter saves power consumption by reducing the number of active elements in the continuous-time sigma-delta modulator. Also, the core biquad filter allows the loop filter of a high-order modulator to be implemented by cascading low-order biquad sections, considerably easing the design and implementation of the high-order continuous-time sigma-delta modulator. The proposed loop filter is a general type of hybrid filter which could be used for the both high and low oversampling ratios (OSRs). Experiment on a 5th-order low pass continuous-time sigma-delta modulator with a bandwidth of 30 MHz is conducted successfully and the results are presented.

DOI10.1109/ISCAS.2009.5118462