A novel noise-shaping DAC for multi-bit sigma-delta modulator

Author

Chen, Jianzhong ; Xu, Yong Ping

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore

Volume

53

Issue

5

fYear

2006

fDate

5/1/2006 12:00:00 AM

Firstpage

344

Lastpage

348

Abstract

This paper describes a new noise-shaping technique for reducing the noise of the internal digital-analog conversion (DAC) in multi-bit low-pass sigma-delta modulators. The proposed technique works with most existing dynamic element matching (DEM) algorithms to provide noise shaping to the DAC noise. The simulation shows that a 10-dB improvement in the signal-to-noise conversion ratio can be obtained with the proposed noise-shaping with DEM (NSDEM) technique. A dithered DAC employing NSDEM is realized in a 0.35-μm CMOS process and the test result shows the first-order high-pass noise shaping to the DAC noise, and validates the proposed concept.

Keywords

CMOS integrated circuits; circuit noise; digital-analogue conversion; sigma-delta modulation; 0.35 micron; CMOS process; DAC noise; DEM algorithms; NSDEM technique; digital-analog conversion; dynamic element matching algorithms; high-pass noise shaping; low-pass sigma-delta modulators; multi-bit sigma-delta modulator; noise-shaping DAC; noise-shaping technique; signal-to-noise conversion ratio; Degradation; Digital modulation; Filters; Integrated circuit noise; Multi-stage noise shaping; Noise generators; Noise reduction; Noise shaping; Signal resolution; Transfer functions; Digital–analog conversion (DAC); mixed analog-digital integrated circuits; noise; sigma–delta (;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.869920

Filename

1632341