A Low-Power, High-Fidelity Stereo Audio Codec in 0.13 μm CMOS

被引:16
作者
Jiang, Xicheng [1 ]
Song, Jungwoo [1 ]
Chen, Jianlong [1 ]
Chandrasekar, Vinay [1 ]
Galal, Sherif [1 ]
Cheung, Felix Y. L. [1 ]
Cheung, Darwin [1 ]
Brooks, Todd L. [1 ]
机构
[1] Broadcom Corp, Irvine, CA 92617 USA
关键词
Capacitive direct feedback; capacitive-feed forward; class-AB amplifier; continuous-time Sigma Delta ADC; microphone interface; quiescent current control; replica bias; speaker interfaces; stereo audio codec; transconductance cell; AMPLIFIER;
D O I
10.1109/JSSC.2012.2185591
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A 1.5 V low-power stereo audio codec in 0.13 mu m CMOS is described. The microphone path includes a programmable gain stage with an enhanced transconductance cell followed by a continuous-time Sigma Delta 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 Omega speaker. The audio input and output paths achieve 92 and 98 dB dynamic range, respectively, with 6.5 mA total quiescent current.
引用
收藏
页码:1221 / 1231
页数:11
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