Title :
A Low-Power and Compact Sigma-Delta Voice-band Codec in a 0.18-μm CMOS Technology
Author :
Ho, Daniel Quoc-Dang ; Chang, Chinchi ; Rathore, Jeetin ; D´Souza, L. ; Swei, Yuwen ; Chen, Kuan-Dar ; Lin, Jyhfong
Author_Institution :
VIA Technol., Inc., Fremont, CA
Abstract :
A 2.7V fully-integrated voice-band codec for digital cellular phone applications is presented. The codec includes a 16b ΣΔ ADC and DAC, channel filters, PGAs, a low-noise microphone preamplifier and 32 Ω loudspeaker/earpiece drivers. With a PLL for clock generation and a voltage reference integrated on the same chip, the ADC achieves an SNDR of 83 dB and a dynamic range of 88 dB in a 4 KHz signal bandwidth, while the DAC yields 80 dB and 84 dB, respectively. Analog and digital portions of the codec consume only 4.8 mA and 0.53 mA, respectively, and occupy a combined area of 1.0 mm2 in a 0.18-μm CMOS technology
Keywords :
CMOS integrated circuits; codecs; digital-analogue conversion; driver circuits; low-power electronics; phase locked loops; reference circuits; sigma-delta modulation; 0.18 micron; 0.53 mA; 2.7 V; 32 ohm; 4 kHz; 4.8 mA; CMOS technology; analog-to-digital converters; channel filters; clock generation; digital cellular phone; digital-to-analog converters; earpiece drivers; loudspeaker drivers; microphone preamplifier; phase locked loop; sigma-delta voice-band codec; voltage reference; CMOS technology; Cellular phones; Codecs; Delta-sigma modulation; Electronics packaging; Filters; Loudspeakers; Microphones; Phase locked loops; Preamplifiers;
Conference_Titel :
VLSI Design, Automation and Test, 2006 International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0179-8
Electronic_ISBN :
1-4244-0180-1
DOI :
10.1109/VDAT.2006.258109
