Title :
Integrated Class-D Audio Amplifier With 95% Efficiency and 105 dB SNR
Author :
Xicheng Jiang ; Jungwoo Song ; Cheung, Darwin ; Minsheng Wang ; Arunachalam, Sasi Kumar
Author_Institution :
Broadcom Corp., Irvine, CA, USA
Abstract :
An integrated ultralow EMI Class-D amplifier with a feed-forward ADC and feedback filters is demonstrated in a 180 nm CMOS and wire-bonded package. Circuit and architecture techniques, which enable 1.75 W into an 8 Ohm speaker, 105 dB SNR, 95% efficiency, 0.004% THD+N, and 15.4 dB margin beyond the EN55022 Class-B standard, are discussed.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; electromagnetic interference; lead bonding; CMOS; Class-D audio amplifier; EMI; EN55022 Class-B standard; feed-forward ADC; feedback filters; power 1.75 W; resistance 8 ohm; size 180 nm; wire-bonded package; Batteries; Frequency modulation; Gain; Noise; Power generation; Pulse width modulation; ADC; EMI; SNR; THD+N; audio; class-D amplifier; efficiency; feed-forward; feedback; filter;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2014.2335713
