A low-power, second-order Δ/Σ modulator using a single class-AB op-amp for voice-band applications

被引：0
|
作者：
Safarian, Aminghasem [1 ]
Sahandiesfanjani, Farzad
Heydari, Payam
Atarodi, S. Mojtaba
机构：
[1] Univ Calif Irvine, Irvine, CA 92697 USA
[2] Tripath Technol Inc, San Jose, CA USA
[3] Sharif Univ Technol, Tehran, Iran
来源：
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2006年 / 49卷 / 02期
关键词：
low power; delta/sigma modulator; class-AB op-amp; voice band application;
D O I：
10.1007/s10470-006-9567-6
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
The design of a power-efficient second-order Delta/Sigma modulator for voice-band is presented. At system level, a new single-loop, single-stage modulator is proposed. The modulator employs only one class-AB op-amp to realize a second-order noise shaping for voice-band applications. The modulator is designed in a 0.25 mu m standard CMOS process, and exhibits 86 dB dynamic range (DR) for a 4 kHz voice-bandwidth. The proposed modulator consumes 125 mu W from a 2.5 V supply.
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页码：199 / 211
页数：13
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