Stability and performance analysis of an adaptive sigma-delta modulator

Author

Aldajani, Mansour A. ; Sayed, Ali H.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

48

Issue

3

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

233

Lastpage

244

Abstract

This work develops an adaptive sigma-delta modulator that is based on adapting the quantizer step-size using estimates of the quantizer input rather than the modulator input. The adaptive modulator with a first-order noise shaping filter is shown to be bounded-input bounded-output stable. Moreover, an analytical expression for the signal-to-noise ratio is derived, and it is shown to be independent of the input signal strength. Simulation results confirm the signal-to-noise ratio performance and indicate considerable improvement in the dynamic range of the modulator compared to earlier structures

Keywords

adaptive signal processing; circuit stability; quantisation (signal); sigma-delta modulation; adaptive sigma-delta modulator; bounded-input bounded-output stable; dynamic range; first-order noise shaping filter; input signal strength; performance analysis; quantizer step-size; signal-to-noise ratio; stability analysis; Delta-sigma modulation; Demodulation; Dynamic range; Low pass filters; Noise shaping; Performance analysis; Quantization; Signal to noise ratio; Stability analysis; Variable speed drives;

fLanguage

English

Journal_Title

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

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.924066

Filename

924066