The digital PWM input class-D acoustic amplifier by PWM negative feedback

摘要

The present invention relates to digital PWM input class-D acoustic amplifier by PWM negative feedback, in particular, the difference between the output signals and negative feedback PWM signal digital modulation unit for modulating the PCM signal to a PWM signal of the input audio, digital modulation unit and, an output unit in response to the PWM switching signal correction unit and the pulse width generated by comparing the PWM ramp signal and generating a PWM switching signal, the correction unit and the pulse width generation, generating an output audio signal amplified , and, and a voltage negative feedback loop which negatively feeds back the output signal of the unit, reducing the harmonic components, and provides the correction unit and the pulse width generation. For more information, the correction unit and the pulse width generated according to the present invention, a PWM ramp signal voltage amplification section for amplifying the difference signal of the voltage negative feedback loop PWM signal passing through the filter is input, PWM signal is input generating PWM- lamp conversion unit, and consists of comparing section that compares the ramp signal and the PWM output signal of the voltage amplification unit, and generates a PWM switching signal. Therefore, as compared with the sawtooth ramp signal PWM negative or positive (+) and the negative feedback signal of the PWM output signal, and adjust the on / off time of the switching transistor of the output unit, the invention PWM pulse width It is possible by correcting the, to improve the linearity of the output PWM.