A Method for the Schmitt-Trigger Propagation-Delay Compensation in Asynchronous Sigma-Delta Modulator

被引：9

作者：

Matic, Tomislav ^{[1
]}

Svedek, Tomislav ^{[1
]}

Herceg, Marijan ^{[1
]}

机构：

[1] Fac Elect Engn, Dept Commun, HR-31000 Osijek, Croatia

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2012年 / 59卷 / 07期

关键词：

Asynchronous sigma-delta modulator (ASDM); hysteresis voltage; propagation delay; Schmitt trigger; CONVERSION; QUANTIZER; EXCESS; CYCLE;

D O I：

10.1109/TCSII.2012.2198981

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 brief provides the mathematical analysis of the Schmitt-trigger propagation-delay influence on the asynchronous sigma-delta modulator (ASDM) output-signal frequency spectrum. Beside the propagation delay, the Schmitt-trigger slew-rate impact has been also presented. Based on the mathematical analysis, a method for the Schmitt-trigger propagation-delay compensation has been proposed. The method is implemented by introducing hysteresis-level modulation. The first-order ASDM simulation and measurement models have been proposed for the propagation-delay influence to the ASDM output-signal frequency and for the compensation method verification. The measurement and simulation results for the proposed method confirm the ASDM output frequency spectrum improvement.

引用

页码：404 / 408

页数：5

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