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
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