Method and apparatus for high performance class D audio amplifiers
AssigneeMonolithic Power Systems, Inc.
InventorsJeff Kotowski, Qizhang Yin
Life of this patent
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Abstract
The present disclosure provides a method and apparatus for high performance class D audio amplifier circuit that includes: a modulator circuit for receiving a PWM input signal and generating a control signal, a driver control circuit, a switching circuit, and a feedback circuit. The driver control circuit is adapted to generate a drive signal for the switching circuit. The driving signal provides compensation for noise and distortions in a PWM output signal at each cycle by selecting either a first pulse signal or a second pulse signal based on the information of the control signal.
Claims22
A class D audio amplifier, comprising:
- a modulator circuit, electrically coupled to receive a Pulse Width Modulation (PWM) input signal, operable to provide a control signal;
- a driver control circuit, electrically coupled to said modulator circuit, operable to generate a drive signal that provides compensation in a PWM output signal at each cycle by selecting either a first pulse signal or a second pulse signal based on said control signal;
- a switching circuit, electrically coupled to said driver control circuit, operable to switch on and off to generate said PWM output signal in response to said drive signal;
- and
- a feedback circuit, electrically coupled to said switching circuit and to said modulator circuit, operable to provide a feedback of said PWM output signal.
A method of generating an analog signal comprising:
- providing a feedback output signal;
- quantizing the difference between said feedback output signal and an input signal to obtain a control signal;
- and
- modulating the duty cycle of said output signal based on said control signal, wherein said modulating of the duty cycle of said output signal comprises selecting either a first pulse signal or a second pulse signal according to said control signal.
Dependencies are inferred from the claim text.