A low-voltage switched-current delta-sigma modulator

Author

Tan, Nianxiong ; Eriksson, Sven

Author_Institution

Dept. of Electr. Eng., Linkoping Univ., Sweden

Volume

30

Issue

5

fYear

1995

fDate

5/1/1995 12:00:00 AM

Firstpage

599

Lastpage

603

Abstract

This paper presents the design of a fully differential switched-current delta-sigma modulator using a single 3.3-V power-supply voltage. At system level, we tailor the modulator structure considering the similarity and difference of switched-capacitor and switched-current realizations. At circuit level, we propose a new switched-current memory cell and integrator with improved common mode feedback, without which low power-supply-voltage operation would not be possible. The whole modulator was implemented in a 0.8-μm double-metal digital CMOS process. It occupies an active area of 0.53×0.48 mm² and consumes a current of 0.6 mA from a single 3.3-V power supply. The measured dynamic range is over 10 b

Keywords

CMOS integrated circuits; analogue storage; circuit feedback; integrating circuits; mixed analogue-digital integrated circuits; modulators; sigma-delta modulation; switched current circuits; 0.6 mA; 0.8 micron; 3.3 V; common mode feedback; double-metal digital CMOS process; fully differential configuration; low-voltage operation; single power-supply voltage; switched-current delta-sigma modulator; switched-current integrator; switched-current memory cell; CMOS process; Capacitors; Clocks; Delay; Delta modulation; Digital modulation; Feedback; Power supplies; Switching circuits; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.384176

Filename

384176