Title :
An enhanced dynamic range low-power delta-sigma modulator for portable voice band applications
Author :
Safarian, A.Q. ; Aslanzadeh, H. Amir ; Mehrmanesh, S. ; Vahidfar, M.B.
Author_Institution :
Sharif Univ. of Technol., Iran
Abstract :
A new second order sigma delta modulator with the reduced number of op-amps, to decrease static power consumption and area, is presented for voice band applications such as codecs. This switched capacitor modulator uses reused capacitor technique to reduce the input thermal noise and circuit area. It improves the DR of modulator by almost 0.5 bit. The modulator shows 87 dB DR for voice band while consuming 125 μW from a 2.5 V supply.
Keywords :
CMOS integrated circuits; delta-sigma modulation; integrated circuit noise; low-power electronics; modulators; speech codecs; switched capacitor networks; thermal noise; voice communication; 125 muW; 2.5 V; SC modulator; enhanced dynamic range; input thermal noise reduction; low-power delta-sigma modulator; op-amp number reduction; portable voice band applications; second order sigma delta modulator; switched capacitor modulator; Codecs; Delta modulation; Delta-sigma modulation; Dynamic range; Energy consumption; Modulation coding; Noise reduction; Operational amplifiers; Switched capacitor circuits; Switching circuits;
Conference_Titel :
Mixed-Signal Design, 2003. Southwest Symposium on
Print_ISBN :
0-7803-7778-8
DOI :
10.1109/SSMSD.2003.1190439
