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.
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