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Audio amplifier

A technology of audio amplifiers and operational amplifiers, applied in the direction of audio amplifiers, low-frequency amplifiers, amplifiers, etc., can solve the problems of output audio signal vibration, damage to audio amplifiers, bias voltage vibration of bias circuits, etc., and achieve the effect of eliminating pop noise

Inactive Publication Date: 2009-11-11
HIMAX TECH LTD
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AI Technical Summary

Problems solved by technology

However, when the audio amplifier is just powered on (just started), because the power (such as the supply voltage) is suddenly applied to the bias circuit, the bias voltage generated by the bias circuit will vibrate considerably.
Therefore, the output audio signal generated according to this bias voltage will also vibrate, thus damaging the audio amplifier and producing unwanted popping noise

Method used

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Examples

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Embodiment Construction

[0023] The decoupling device of the following embodiments can stabilize the bias voltage of the audio amplifier to eliminate or reduce the pop noise of the output audio signal.

[0024] Please refer to figure 1 , which shows a block diagram of an audio amplifier according to an embodiment of the present invention. The audio amplifier includes an amplifying circuit 105 , a bias control circuit 101 and a decoupling device 103 . The amplification circuit 105 amplifies the audio signal VI. The bias control circuit 101 provides a bias voltage VB to the amplifying circuit 105 according to the power off signal PWD, wherein the power off signal PWD indicates that the audio amplifier is powered on or off. The decoupling device 103 can reduce the damping phenomenon of the bias voltage VB caused when the audio amplifier is powered on or off.

[0025] When the audio amplifier is just powered on / off, the power is suddenly transmitted to the bias control circuit 101, the bias control cir...

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PUM

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Abstract

An audio amplifier includes an amplifying circuit, a bias control circuit, and a decoupling device. The amplifying circuit amplifies an audio signal. The bias control circuit provides at least one bias voltage for the amplifying circuit according to a power down signal, in which the power down signal represents that the audio amplifier is powered on or powered down. The decoupling device reduces the damping phenomenon of the bias voltage caused by powering on or powering down the audio amplifier.

Description

technical field [0001] The invention relates to a power amplifier. And in particular to a power amplifier for amplifying audio signals. Background technique [0002] Audio amplifiers are used to amplify audio signals. These audio amplifiers basically include an audio input section and an audio output section. The audio input part receives a signal source, and the audio output part is connected to an audio device, such as a speaker, wherein the audio amplifier receives audio signals from the signal source, amplifies these audio signals, generates audio current signals according to the amplified audio signals, and outputs, etc. Audio current signal to speaker. The audio current signal drives the speaker and causes the speaker to play the audio signal from the signal source to produce sound. [0003] In order to amplify the audio signal, the amplifying circuit of the audio amplifier basically needs a bias voltage circuit, which generates a bias voltage to bias the amplifyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20H03F3/45H03F1/30H03F1/52
CPCH03F2203/45528H03F2203/45138H03F2203/45548H03F3/45475H03F3/187H03F1/305H03F2200/03
Inventor 黄志豪
Owner HIMAX TECH LTD
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