Title :
Design techniques for CMOS micropower low-voltage switched-capacitor delta-sigma modulator
Author :
Lee, Tsung-Sum ; Lin, Wen-Bin ; Lee, Dung-Lin
Author_Institution :
Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Taiwan
Abstract :
The design of a micropower, low-voltage switched-capacitor delta-sigma modulator that consumes only 90 μW at 1.5V supply is described. The modulator is designed employing bootstrapped switches in order to facilitate low voltage operation. Low power dissipation is obtained through the use of biasing some transistors in weak inversion. The delta-sigma modulator achieves an 88dB dynamic range and a peak signal to noise plus total harmonic distortion ratio of 67.1dB with a sampling rate of 1MHz and an oversampling ratio of 128.
Keywords :
CMOS integrated circuits; delta-sigma modulation; harmonic distortion; low-power electronics; modulators; switched capacitor networks; 1.5 V; 90 muW; CMOS delta-sigma modulator; bootstrapped switches; dynamic range; low power dissipation; low-voltage delta-sigma modulator; oversampling ratio; peak signal to noise; quantizer; second-order structure; switched-capacitor delta-sigma modulator; total harmonic distortion ratio; transistor biasing; weak inversion; Bandwidth; CMOS technology; Clocks; Delta modulation; Dynamic range; Low voltage; Operational amplifiers; Switches; Switching circuits; Transistors;
Conference_Titel :
Advanced System Integrated Circuits 2004. Proceedings of 2004 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-8637-X
DOI :
10.1109/APASIC.2004.1349395
