A low-voltage low-power sigma-delta modulator for bio-potential signals

Author

Liu, Szu-Chieh ; Tang, Kea-Tiong

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

fYear

2011

fDate

7-8 April 2011

Firstpage

24

Lastpage

27

Abstract

This paper presents the design and implementation of a low-power, low-voltage sigma delta modulator (SDM) with a standard 0.18μm CMOS technology. A novel cascode current mirror operational trans-conductance amplifier (OTA) is utilized to enlarge the input common-mode range. The one-stage OTA structure is simple and low-power comparing with the traditional multi-stage folded cascode structure. The designed modulator achieved 68.6-dB signal-to-noise-and-distortion-ratio (SNDR) in 10-kHz bandwidth with an oversampling ratio of 64. The power consumption was 60μW with an 0.9-V power supply.

Keywords

CMOS integrated circuits; bioelectric potentials; modulators; operational amplifiers; sigma-delta modulation; CMOS technology; biopotential signal; low-power sigma-delta modulator; low-voltage sigma-delta modulator; multi-stage folded cascode structure; one-stage OTA structure; operational trans-conductance amplifier; power 60 muW; voltage 0.9 V; Bandwidth; Digital filters; Modulation; Power demand; Sigma delta modulation; Switches; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Life Science Systems and Applications Workshop (LiSSA), 2011 IEEE/NIH

Conference_Location

Bethesda, MD

Print_ISBN

978-1-4577-0421-5

Type

conf

DOI

10.1109/LISSA.2011.5754146

Filename

5754146