Swing limiter circuit
AssigneeQUALCOMM Incorporated
InventorsJingxue Lu, Chenling Huang
Life of this patent
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Abstract
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.
Claims20
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;
- and
- a 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;
- and
- a second transconductance configured to couple the second feedback path to ground.
An apparatus comprising:
- means for generating differential pulse width modulated (PWM) signals;
- and
- means for attenuating a plurality of common-mode signal components associated with the differential PWM signals using a first transconductance to couple a first feedback path to ground and using a second transconductance to couple a second feedback path to ground.
A method comprising:
- generating, at a first circuit, differential pulse width modulated (PWM) signals;
- and
- attenuating, at a second circuit, a plurality of common-mode signal components associated with the differential PWM signals using a first transconductance to couple a first feedback path to ground and using a second transconductance to couple a second feedback path to ground.
Dependencies are inferred from the claim text.