Double-index averaging: a novel technique for dynamic element matching in Σ-Δ A/D converters

Author

Cini, Dario ; Samori, Carlo ; Lacaita, Andrea L.

Author_Institution

Dipt. di Elettronica, Politecnico di Milano, Italy

Volume

46

Issue

4

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

353

Lastpage

358

Abstract

We report the study of a second-order Σ-Δ modulator for audio applications with a nine-levels quantizer. The feedback digital-to-analog has been implemented with four capacitors and two voltage references, taking the structure typical of fully differential system. We first discuss the performance achievable with the most popular dynamic element-matching techniques, namely the data-weighted averaging and individual-level averaging. We then introduce a new algorithm, the double-index averaging, that performs better than the other algorithms by 10-15 dB over the entire dynamic range of the modulator, and 6 dB at the peak of signal/(quantization noise+total harmonic distortion)

Keywords

sigma-delta modulation; A/D converter; algorithm; data-weighted averaging; differential system; digital audio; double-index averaging; dynamic element matching; feedback digital-to-analog converter; individual-level averaging; multilevel quantizer; second-order Σ-Δ modulator; Bandwidth; CMOS technology; Capacitors; Circuits; Feedback; Linearity; Signal resolution; Signal synthesis; Very large scale integration; Voltage;

fLanguage

English

Journal_Title

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

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.755406

Filename

755406