Stability and performance analysis of an adaptive sigma-delta modulator

被引：27

作者：

Aldajani, MA ^{[1
]}

Sayed, AH ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2001年 / 48卷 / 03期

基金：

美国国家科学基金会;

关键词：

adaptive step-size; dynamic range; quantization; sigma-delta modulation; stability;

D O I：

10.1109/82.924066

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：233 / 244

页数：12

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