Adjustable gain audio power amplification circuit

A technology of amplifying circuit and audio power, which is applied in gain control, amplification control, improvement of control circuit for reducing distortion, etc. It can solve problems such as crackling sound, speaker or earphone impact, ear discomfort, etc., and suppress crackling sound , the effect of simple structure

Inactive Publication Date: 2012-02-15
新疆芯团科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the audio power amplifying circuit, when the gain is adjusted, the output signal of the audio power amplifying circuit often jumps, which is easy to cause impact on the speaker or earphone and produce crackling sound, which makes sensitive ears very uncomfortable.

Method used

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  • Adjustable gain audio power amplification circuit
  • Adjustable gain audio power amplification circuit
  • Adjustable gain audio power amplification circuit

Examples

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Embodiment Construction

[0014] see figure 2 and image 3 A preferred embodiment of the gain-adjustable audio power amplification circuit of the present invention includes an input unit, an audio amplification unit connected to the input unit, a gain adjustment unit connected to the audio amplification unit, and a gain adjustment unit connected to the gain adjustment unit. A control unit, a comparison unit connected between the gain adjustment unit and the control unit, and an output unit connected with the audio amplification unit. Wherein, the input unit includes a first input terminal Vinn, a second input terminal Vinp, a first resistor R11 and a second resistor R12; the audio amplifier unit is an audio amplifier PA; the gain adjustment unit includes a first An adjustable resistor RF1 and a second adjustable resistor RF2; the control unit is a gain controller CTRL; the comparison unit is a zero-crossing detection comparator COM; the output unit is an output terminal Vout.

[0015] The input unit...

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PUM

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Abstract

The invention discloses an adjustable gain audio power amplification circuit which comprises an input unit, an audio amplification unit, a gain adjusting unit, a control unit, a comparison unit and an output unit, wherein the audio amplification unit is connected with the input unit, the gain adjusting unit is connected with the audio amplification unit, the control unit is connected with the gain adjusting unit, the comparison unit is connected between the gain adjusting unit and the control unit, and the output unit is connected with the audio amplification unit; the comparison unit compares an output signal of the output unit with a common-mode reference voltage and outputs a gain adjusting control signal to the control unit, and the gain adjusting control signal is inversed when the output signal of the output unit is equal to the common-mode reference voltage; when detecting that the gain adjusting control signal is inversed, the control unit transmits a received gain adjusting signal to the gain adjusting unit; then, the gain adjusting unit controls the gain of the adjustable gain audio power amplification circuit according to the received gain adjusting signal. The adjustable gain audio power amplification circuit disclosed by the invention is simple in structure, and cracking noise generated by gain adjusting is avoided.

Description

technical field [0001] The invention relates to an amplifying circuit, in particular to an adjustable gain audio frequency power amplifying circuit with a zero-crossing detection function. Background technique [0002] In the audio power amplifying circuit, when the gain is adjusted, the output signal of the audio power amplifying circuit often jumps, which is easy to cause impact on the speaker or earphone and produce crackling sound, which makes sensitive ears very uncomfortable. . Such as figure 1 The audio power amplifying circuit in the prior art shown is a simulated waveform of the output signal when the gain adjustment is performed, from which it can be seen that the output signal has obvious jumps. [0003] Therefore, it is necessary to provide an adjustable-gain audio power amplifying circuit capable of effectively suppressing the crackle generated by gain adjustment, so that the output signal of the audio power amplifying circuit will not jump during gain adjustm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20H03G1/04
CPCH03G1/04H03G3/3005
Inventor 朱国军
Owner 新疆芯团科技集团有限公司
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