Digital audio power amplifier and electronic device
A power amplifier, digital audio technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve problems such as digital audio power amplifiers not working properly
Pending Publication Date: 2020-02-28
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology
[0004] 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 internal current source and the power amplifier loop driver module do not have enough voltage margin, so that the digital audio power amplifier cannot normal working condition
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[0058] As mentioned in the background, when the output voltage of the digital audio power amplifier in the prior art is high, the digital audio power amplifier cannot work normally because the internal current source and the power amplifier loop driver module do not have enough voltage margin. Case.
[0059] Specifically, refer to figure 1 , figure 1 It is a schematic structural diagram of a digital audio power amplifier in the prior art, figure 1 The driving circuit 10, the first integrator 20 and the second integrator 30 of the digital audio power amplifier are shown in the figure; Input the digital audio signal such as I2S, and then sample the digital audio signal, delta-sigma (Δ-∑) noise shaping and BD modulation, output the in-phase signal and anti-phase signal shaped by delta-sigma respectively and compare them with the triangle wave signal Get two pulse width modulation signals PWMP and PWMN.
[0060] The driving circuit 10 is used to receive the PWMP signal and the...
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The invention discloses a digital audio power amplifier and an electronic device, wherein the digital audio power amplifier provides a pull current or a sink current for an integrator through a firstauxiliary current source and a second auxiliary current source when a driving circuit works, so that when the output voltage of the digital audio power amplifier is relatively higher, the requirementfor a reference voltage provided in the integrator is reduced, the situation that when the reference voltage provided in the integrator is the same as the maximum working voltage supported by the integrator, a current source and a power amplifier loop driving module in the integrator do not have enough voltage margin to support work, is avoided, the digital audio power amplifier can still work normally when the output voltage is relatively higher, and a foundation is laid for realizing the higher power output of the audio power amplifier, and the audio power amplifier can obtain the higher volume and the better tone quality.
Description
technical field [0001] The present application 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 due to their efficiency exceeding 80%, especially high efficiency is very important for mobile devices, which can not only prolong the working time of mobile devices, but also reduce the heat generation of mobile devices such as mobile phones . Class D audio power amplifiers are mainly divided into two categories, one is an analog audio power amplifier, and the input part of the power amplifier is connected to an analog signal; the other is a digital audio power amplifier, and its input part is connected to an I2S (Inter-ICSound, integrated circuit Built-in audio bus) and other digital signals, audio signals are transmitted through digital signals, with extremely high anti-RF (Radio Frequency,...
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Login to View More IPC IPC(8): H03F3/217
CPCH03F3/217
Inventor 周佳宁张海军姚炜程剑涛杜黎明孙洪军
Owner SHANGHAI AWINIC TECH CO LTD