Swing limiter circuit

摘要

A differential class-D amplifier module having common-mode swing limiter circuit is disclosed. The differential class-D amplifier module may include differential class-D amplifier configured to generate differential pulse width modulated (PWM) output signals based on differential input signals and at least a portion of the differential PWM output signals that are fed back to the differential class-D amplifier. The common-mode swing limiter circuit may attenuate one or more common-mode signal components associated with the PWM output signals that may be fed back to input terminals of the differential class-D amplifier.

主权项

1. An apparatus comprising:
a first circuit configured to generate differential pulse width modulated (PWM) signals, the first circuit comprising:
a first feedback path coupled between a first output terminal of the first circuit and a first input terminal of the first circuit; anda second feedback path coupled between a second output terminal of the first circuit and a second input terminal of the first circuit; and a second circuit, coupled to the first circuit, configured to attenuate a plurality of common-mode signal components associated with the differential PWM signals, the second circuit comprising:
a first transconductance configured to couple the first feedback path to ground; anda second transconductance configured to couple the second feedback path to ground.