Digital audio power amplifier

Abstract

The invention discloses a digital audio power amplifier. Corresponding auxiliary pull currents are provided for the input ends of the corresponding integrators through the first auxiliary current source and the second auxiliary current source, and the situation that the first side current source, the second side current source and corresponding power amplifier loops of the integrators do not haveenough voltage margin to support normal work of the circuits is avoided. And secondly, the influence of the process deviation of the current source on the current provided for the integrator is improved, the difference of the voltages provided for the audio load by the first integrator and the second integrator respectively is reduced, and the direct-current offset voltage is eliminated. A first auxiliary state and a second auxiliary state of a driving circuit alternately operate. Therefore, the first auxiliary current source and the second auxiliary current source alternately provide auxiliary pull current for the input end of the first integrator and the second integrator respectively, and the situation that the power supply rejection ratio is reduced due to non-ideal factors such as mismatching of the manufacturing process of the first auxiliary current source and the manufacturing process of the second auxiliary current source is avoided.

Description

technical field [0001] The present invention relates to the technical field of digital audio power amplifier, and more specifically, relates to a digital audio power amplifier. Background technique [0002] At present, Class D audio power amplifiers are widely used because of their high efficiency exceeding 80%. Especially in the field of electronic equipment such as mobile phones, high-efficiency audio power amplifiers can not only prolong the working time of electronic equipment, reduce the heat generation of electronic equipment, but also obtain greater volume and better sound quality. Class D audio power amplifiers are mainly divided into two categories, one is analog audio power amplifiers, and the other is digital audio power amplifiers. Since the audio signal can be transmitted digitally through the digital audio power amplifier, it has extremely high anti-RF interference performance and low noise floor. Therefore, the current digital audio power amplifier is widely ...

AI Technical Summary

Problems solved by technology

[0003] However, when the output voltage of the digital audio power amplifier in the prior art reaches a higher voltage value (for example, 10V), it will occur that the current source of the digital audio power amplifier and the corresponding power amplifier loop of the integrator do not have enough voltage margin, And make the digital audio power amplifier can not work properly

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