DocumentCode :
1454798
Title :
A Low-Power, High-Fidelity Stereo Audio Codec in 0.13 
m CMOS
Author :
Jiang, Xicheng ; Song, Jungwoo ; Chen, Jianlong ; Chandrasekar, Vinay ; Galal, Sherif ; Cheung, Felix Y L ; Cheung, Darwin ; Brooks, Todd L.
Author_Institution :
Broadcom Corp., Irvine, CA, USA
Volume :
47
Issue :
5
fYear :
2012
fDate :
5/1/2012 12:00:00 AM
Firstpage :
1221
Lastpage :
1231
Abstract :
A 1.5 V low-power stereo audio codec in 0.13 μm CMOS is described. The microphone path includes a programmable gain stage with an enhanced transconductance cell followed by a continuous-time ΣΔ ADC with capacitive feed-forward and capacitive direct feedback. The speaker path employs a 1 mA Class-AB speaker amplifier with an improved quiescent current control circuit that delivers 30 mW to a 32 Ω speaker. The audio input and output paths achieve 92 and 98 dB dynamic range, respectively, with 6.5 mA total quiescent current.
Keywords :
CMOS integrated circuits; Hi-Fi equipment; amplifiers; audio coding; codecs; microphones; sigma-delta modulation; CMOS; capacitive direct feedback; capacitive feedforward; class-AB speaker amplifier; continuous time ΣΔ ADC; current 1 mA; current 6.5 mA; microphone; power 30 mW; quiescent current control circuit; resistance 32 ohm; size 0.13 mum; speaker path; stereo audio codec; transconductance cell; voltage 1.5 V; Codecs; Electronics packaging; Gain; Microphones; Noise; Resistors; Transconductance; Capacitive direct feedback; capacitive-feed forward; class-AB amplifier; continuous-time $Sigma Delta$
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2012.2185591
Filename :
6156480
Link To Document :
