CLASS D AUDIO POWER AMPLIFIER, CHIP AND DISTORTION DETECTION CIRCUIT THEREOF

摘要

A distortion detection circuit (10) comprises a first logic operation and triggering module (100), a second logic operation and triggering module (200), and a logic operation module (300). The first logic operation and triggering module (100) performs a first logic operation and first triggering processing on a two-channel pulse width modulation (PWM) signal outputted by a pulse width modulation module (30) to output a first pulse signal. The second logic operation and triggering module (200) performs a second logic operation and second triggering processing on the two-channel PWM signal to output a second pulse signal. If an analog audio signal outputted by a class D audio power amplifier is distorted, the logic operation module (300) executes a third logic operation on the first pulse signal and the second pulse signal to output a distortion indication signal. The distortion detection circuit (10) detects distortion by means of a logic operation and triggering processing. The circuit has a simple structure, thereby effectively reducing power consumption and a chip area.