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 EN55022 Class-B standard, are discussed. [ABSTRACT FROM AUTHOR]