The LC output filters of Class-D audio amplifiers can be simplified if overall feedback is applied to the amplifier – ‘after‑filter’ feedback. Stabilising such systems is notoriously complex. Step forward NXP, which at ISSCC 2017 described a five‑channel 80W/channel audio amplifier for automotive use. To achieve stability, it has integrated low-latency ΔΣ ADCs, each consuming ...
Read full article: ISSCC: Audio amp gets after-filter feedback
from Electronics Weekly http://www.electronicsweekly.com/uncategorised/audio-amp-gets-after-filter-feedback-2017-02/
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