Digital audio power amplifier and electronic equipment

Abstract

The invention provides a digital audio power amplifier and electronic equipment. A voltage division module connected with a feedback resistor is arranged in a negative feedback branch of a first integrator and a negative feedback branch of a second integrator; the voltage in the negative feedback branch is divided, so that the requirement that the reference voltage involved in the integrator is relatively high when the output voltage of the digital audio power amplifier is relatively high is reduced, and the condition that a main current source and a corresponding power amplifier loop of the integrator do not have enough voltage margin to support normal work of the circuit is prevented; the first main state and the second main state of the main drive circuit operate alternately. The current provided for the first integrator and the second integrator is the current mean value of the first side mirror image current module and the second side mirror image current module; the influence ofthe process deviation of the main 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 is reduced, and the excellent sounding effect of the audio load is ensured.

Description

technical field [0001] The invention relates to the technical field of digital audio power amplifiers, and more specifically, to a digital audio power amplifier and electronic equipment. 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 ...

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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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