Patent ID: 7944297

Claim:
A class D amplifier, comprising: a PWM circuit for transferring an analog signal into a PWM signal; a buffer amplifying circuit, electrically connected to the PWM circuit, for amplifying the PWM signal and generating an amplified signal; a low-pass filter, electrically connected to the buffer amplifying circuit, for filtering a high frequency component out from the amplified signal to generate a filtered signal, and then transmitting the filtered signal to a loading of the class D amplifier; a first current source, electrically connected to a feedback node in the PWM circuit, for providing a first current flowing into the feedback node; a second current source, electrically connected to the feedback node, for providing a second current flowing out from the feedback node; and a control circuit, electrically connected to the first current source and the second current source, for selectively turning on or off the first current source and the second current source, wherein the first current source comprises a P type MOSFET.