Adaptive delta-sigma modulation for enhanced input dynamic range

被引：2
|
作者：
Zierhofer, Clemens M. [1 ]
机构：
[1] Univ Innsbruck, C Doppler Lab Act Implantable Syst, Inst Ion Phys & Appl Phys, A-6020 Innsbruck, Austria
来源：
EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING | 2008年 / 2008卷 / 1期
关键词：
Information Technology; Input Signal; Quantum Information; Feedback Signal; Full Article;
D O I：
10.1155/2008/439203
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：
An adaptive delta-sigma modulator of 1st order with one-bit quantization is presented. Adaptation is instantaneous and based on an exponential law. The feedback signal is a multibit discrete-level signal generated by a digital-to-analog converter (DAC). Compared to a nonadaptive delta-sigma modulator of 1st order, the input dynamic range is significantly enhanced. The gain in dynamic range is 6 dB per bit defining the feedback amplitude. The influence of nonideal DAC performance is discussed. It is demonstrated that an implementation of the system is realistic with standard CMOS technology. To relax the requirements to the one-bit quantizer, the quantizer input signal is amplified adaptively (Q-Switching). Copyright (C) 2008 Clemens M. Zierhofer.
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页数：7
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