A new fourth-order single-loop delta-sigma modulator for audio applications

Author

Çoban, Abdulkerim L. ; Allen, Phillip E.

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

1

fYear

1996

fDate

12-15 May 1996

Firstpage

461

Abstract

In this paper, a fourth-order single-loop delta-sigma modulator with a new loop topology is presented. The loop-filter is composed of both feedback and feedforward paths. No active summing element is required in the modulator implementation. The modulator has low integrator output swings and high input dynamic range, resulting in relaxed op amp requirements even for low voltage operation. Simulation results indicate that, 94.5 dB peak S/(N+D) is achievable at a clock rate of 2.56 MHz for a 20 kHz baseband. A prototype of the modulator has been fabricated in a 1.2 μm CMOS process and it is currently under test

Keywords

CMOS integrated circuits; audio equipment; circuit feedback; feedforward; sigma-delta modulation; 1.2 micron; 2.56 MHz; CMOS process; audio applications; feedback; feedforward; fourth-order single-loop delta-sigma modulator; input dynamic range; integrator output swing; loop-filter; low voltage operation; op amp; simulation; Baseband; CMOS process; Clocks; Delta modulation; Dynamic range; Feedback loop; Low voltage; Operational amplifiers; Prototypes; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-3073-0

Type

conf

DOI

10.1109/ISCAS.1996.539984

Filename

539984