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Output limiter circuit of amplifier

A limiter circuit, amplifier technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve problems such as harsh noise, output distortion of class D audio power amplifiers, and inability to meet user needs.

Active Publication Date: 2013-08-28
SHANGHAI BEILING
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For traditional Class D audio power amplifiers, when the amplitude of the input audio source signal is too large, the output amplitude of the amplifier will exceed the design working range, which will seriously distort the output of the Class D audio power amplifier and generate harsh noise.
Therefore, the existing Class D audio power amplifier silent charging circuit can no longer meet the needs of users.

Method used

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  • Output limiter circuit of amplifier

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with accompanying drawing.

[0030] Such as figure 1 As shown, an amplifier output limiting circuit of the present invention receives the output signal from the output terminal of the amplifier, and outputs a feedback signal to the input terminal of the amplifier.

[0031] An amplifier output limiting circuit of the present invention includes a first detection module 101 , a second detection module 102 and a driving module 103 .

[0032] The first detection module 101 receives the inverting output signal VN output from the inverting output terminal of the amplifier and the limiting voltage signal VLM input from the outside, and outputs the inverting limiting signal icn, and the second detecting module 102 receives the output signal from the non-inverting output terminal of the amplifier. The non-inverting output signal VP and the externally input limiting voltage signal VLM output the in-phase limitin...

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Abstract

The invention relates to an output limiter circuit of an amplifier. The output limiter circuit of the amplifier comprises a first detection module, a second detection module and a driving module. The first detection module receives amplitude limiting voltage signals VLM and inverted output signals VN and outputs inverted amplitude limiting signals icn. The second detection module receives the amplitude limiting voltage signals VLM and in-phase output signals VP and outputs the inverted amplitude limiting signals icn. The driving module receives the inverted amplitude limiting signals icn or in-phase amplitude limiting signals icp and outputs in-phase feedback signals VSUMP and inverted feedback signals VSUMN, and the in-phase feedback signals VSUMP and the inverted feedback signals VSUMN are currents opposite in flow direction. The output limiter circuit of the amplifier has the advantages that the amplitude of output signals of the amplifier is limited within a design work range, and when the input sound source amplitude is excessively large, serious distortion of output of a D-class audio power amplifier can be avoided, and harsh noise can be eliminated.

Description

technical field [0001] The invention relates to an amplifier output limiting circuit in the field of integrated circuits. Background technique [0002] As we all know, Class D audio power amplifiers usually require an integrator circuit to suppress system noise, and the integrator circuit is composed of an amplifier and a resistor-capacitor feedback network. [0003] For traditional Class D audio power amplifiers, when the amplitude of the input audio source signal is too large, the output amplitude of the amplifier will exceed the design working range, which will seriously distort the output of the Class D audio power amplifier and generate harsh noise. Therefore, the existing silent charging circuit for class D audio power amplifiers can no longer meet the needs of users. Contents of the invention [0004] In order to overcome the deficiencies in the above-mentioned prior art, the present invention provides an amplifier output limiting circuit, which is used as an addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
Inventor 李淼
Owner SHANGHAI BEILING
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