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Gain-adjustable audio power amplifier circuit

An audio power amplifier circuit and the technology of the power amplifier circuit are applied in the direction of power amplifier, electrical components, amplification control, etc., and can solve the problem of inability to adjust the closed-loop gain of the audio power amplifier circuit.

Active Publication Date: 2010-06-30
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this type of audio power amplifier circuit chip is currently unable to adjust the closed-loop gain of the audio power amplifier circuit inside it.

Method used

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  • Gain-adjustable audio power amplifier circuit
  • Gain-adjustable audio power amplifier circuit
  • Gain-adjustable audio power amplifier circuit

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Embodiment Construction

[0021] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] see figure 1 , figure 2 , the present invention is a gain-adjustable audio power amplifier circuit, which includes a first amplifier 101, a second amplifier 102 and a resistance gain network 104, wherein the first amplifier 101 and the second amplifier 102 form a pseudo-differential structure 103 , the inverting input terminal Vn1 of the first amplifier 101 is connected to the inverting input terminal Vin of the entire power amplifier circuit chip through a peripheral input resistor Rin, and at the same time, the inverting input terminal Vn1 of the first amplifier 101 is also connected to the inverting input terminal Vn1 of the first amplifier 101 through a peripheral feedback resistor Rfb The output terminal is connected, the noninverting input terminal Vn3 of the first amplifier 101 is directly connected with the inverting input terminal Vip...

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Abstract

The invention relates to a gain-adjustable audio power amplifier circuit. The power amplifier circuit comprises a pseudo-differential structure and a resistor gain network, the pseudo-differential structure comprises a first amplifier and a second amplifier, the resistor gain network is connected in series between the output ends of the first amplifier and the second amplifier, and the resistor gain network divides the first amplified voltage outputted by the first amplifier and the second amplified voltage outputted by the second amplifier, and outputs a second feedback voltage to the inphase input end of the first amplifier and a first feedback voltage to the antiphase input end of the second amplifier. The invention does not need to increase the number of the pins of a power amplifier circuit chip, and moreover, on the basis of ensuring that an input resistor and a feedback resistor outside the power amplifier circuit chip control the closed-loop gain of the audio power amplifier circuit, the closed-loop gain of the audio power amplifier circuit can be regulated in the power amplifier circuit chip, so that the closed-loop gain can be proportionally increased or reduced.

Description

technical field [0001] The invention relates to an audio power amplifier circuit with adjustable gain. Background technique [0002] Generally, when the amplitude of the input audio signal is too large, or the system power supply drops, the output of the audio power amplifier circuit will be distorted due to the excessive amplitude, which will seriously damage the audio quality. The common solution is to adjust the closed-loop gain of the audio power amplifier circuit , to avoid distortion. For a digital audio power amplifier circuit chip, the existing technology is to adjust the closed-loop gain of the audio power amplifier circuit by adjusting the gain of a digital filter inside the chip. [0003] However, for existing analog audio power amplifier circuit chips, the gain is determined by the ratio of the input resistance and the feedback resistance. Usually, in order to ensure the versatility of the chip, the input resistance and the feedback resistance are provided by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20H03G1/00
Inventor 李淼
Owner SHANGHAI BEILING
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