Multibit Σ-Δ A/D converter incorporating a novel class of dynamic element matching techniques

Author

Leung, Bosco H. ; Sutarja, Sehat

Author_Institution

Dept. of Electr. Eng., Waterloo Univ., Ont., Canada

Volume

39

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

35

Lastpage

51

Abstract

A dynamic element matching technique is applied to multibit sigma-delta modulators. The approach translates the harmonic distortion components of a nonideal digital-to-analog converter (DAC) in the feedback loop of a sigma-delta modulator to high-frequency components, which can then be filtered out by the decimation filter. Computer simulations have confirmed that with this approach a third-order sigma-delta modulator employing a 3-bit forward ADC, a 3-bit feedback DAC with a random mismatch of 0.1% can achieve a 104-dB (17+bit) dynamic range and a harmonic distortion below 100 dB, with an oversampling ratio of 64. The technique does not generate any tone in the passband

Keywords

analogue-digital conversion; coding errors; electric distortion; feedback; harmonics; modulators; Σ-Δ A/D converter; ADC; decimation filter; dynamic element matching; feedback loop; harmonic distortion components; high-frequency components; multibit sigma-delta modulators; nonideal DAC; oversampling ratio; Analog-digital conversion; Computer simulation; Digital filters; Dynamic range; Feedback loop; Harmonic distortion; Passband; Signal to noise ratio; Transfer functions; Very large scale integration;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.204108

Filename

204108