Class-D audio amplifier, adaptive pulse width adjustment method thereof and electronic equipment

Abstract

The invention discloses a class-D audio amplifier, a pulse width adjustment method thereof and electronic equipment. A pulse width modulation module is used for carrying out pulse width modulation on an input signal and outputting a first pulse width modulation signal and a second pulse width modulation signal. A pulse width adjusting module is used for controlling the relative delay between the second pulse width modulation signal and the first pulse width modulation signal according to a first output signal and a second output signal which are output to a load to form a corresponding first delay signal and a corresponding second delay signal. A driving module is used for generating a first output signal and a second output signal which are output to a load according to the first delay signal and the second delay signal, and the pulse width of the first output signal and the pulse width of the second output signal change along with the relative delay. The class-D audio amplifier can adaptively adjust the pulse width of the output signal, and can reduce the power consumption under specific application without introducing the static background noise problem.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, in particular to a Class D audio amplifier, an adaptive pulse width adjustment method thereof, and electronic equipment. Background technique [0002] A Class D audio amplifier is a commonly used high-efficiency amplifier for amplifying audio signals. In a system using a Class D amplifier, an analog input signal is converted into a series of pulse-modulated signals with different pulse widths to drive audio speakers. [0003] The output of the class D audio amplifier is generally full-wave modulation, and usually has two output terminals, which are respectively connected to the two ends of the load. The signals of the two output terminals under static output are 50% duty ratio square wave signals. Considering that the power consumption is positively correlated with the output duty cycle in the case of LC load, under the same conditions, the smaller the duty cycle is, the low...

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Problems solved by technology

[0004] Due to the deviation of the device process in the circuit, the narrow pulse width is likely to disappear during the transmission process, resulting in low noise and distortion problems when using narrow pulse width modulation.

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