A 1.95-V, 0.34-mW, 12-b sigma-delta modulator stabilized by local feedback loops

Author

Au, Stephen ; Leung, Bosco H.

Author_Institution

Maxim Integrated Products, Sunnyvale, CA, USA

Volume

32

Issue

3

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

321

Lastpage

328

Abstract

The design of a low-power, low-voltage, 12-b 8-kHz bandwidth ΣΔ modulator for high-quality voice that consumes only 0.34 mW at 1.95 V supply is described. The modulator employs a special architecture in which a third-order modulator is stabilized by a local feedback loop around each integrator. Unlike multistage ΣΔ modulators, this architecture is very tolerant to the modest dc gain of low voltage op-amps. The architecture, together with special circuit techniques, permits a low-voltage switched capacitor implementation at 1.95 V-3.3 V supply using standard 1.2-μm CMOS technology

Keywords

CMOS integrated circuits; circuit feedback; circuit stability; harmonic distortion; integrated circuit design; sigma-delta modulation; switched capacitor networks; 0.34 mW; 1.2 mum; 1.95 V; 8 kHz; CMOS technology; architecture; dc gain; design; high-quality voice; local feedback loop stabilization; low voltage op-amps; low-power low-voltage ΣΔ modulator; low-voltage switched capacitor implementation; oversampled A/D converter; sigma-delta modulator; third-order modulator; Bandwidth; CMOS technology; Delta-sigma modulation; Digital modulation; Energy consumption; Feedback loop; Frequency; Gold; Operational amplifiers; Sampling methods;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.557629

Filename

557629