A second-order sigma-delta modulator with built-in VGA to improve SNR and harmonic distortion

被引：0
|
作者：
Li, XP [1 ]
Ismail, M [1 ]
机构：
[1] Ohio State Univ, Analog VLSI Lab, Caldwell Lab 301, Columbus, OH 43210 USA
来源：
NINTH GREAT LAKES SYMPOSIUM ON VLSI, PROCEEDINGS | 1999年
关键词：
D O I：
10.1109/GLSV.1999.757460
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
A modified architecture of the second-order switched-capacitor modulator is proposed. A simple four-transistor variable gain attenuator is included in the architecture which continuously adjusts the reference voltage of the quantizer feedback. This improves the output SNR for small signal input and reduces the harmonic distortion for large signal input. Simulation results show that it achieves higher dynamic range and lower harmonic distortions compared with the traditional architecture.
引用
收藏
页码：376 / 379
页数：4
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