Integrated Class-D Audio Amplifier With 95% Efficiency and 105 dB SNR

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...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2014-11, Vol.49 (11), p.2387-2396
Main Authors: Xicheng Jiang, Jungwoo Song, Cheung, Darwin, Minsheng Wang, Arunachalam, Sasi Kumar
Format: Article
Language:English
Subjects:
ADC
audio
Batteries
class-D amplifier
efficiency
EMI
feed-forward
feedback
filter
Frequency modulation
Gain
Noise
Power generation
Pulse width modulation
SNR
THD+N
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Summary: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.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2014.2335713