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Circuit for suppressing audio output noise and audio output circuit

An audio output and circuit technology, applied in transducer circuits, electrical components, sensors, etc., can solve the problems of complex circuit design and small application range of noise suppression circuits, and achieve the effect of easy circuit design and suppression of transient noise.

Active Publication Date: 2018-03-23
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical solution of the present invention solves the problems of small application range and complex circuit design of existing noise suppression circuits

Method used

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  • Circuit for suppressing audio output noise and audio output circuit
  • Circuit for suppressing audio output noise and audio output circuit
  • Circuit for suppressing audio output noise and audio output circuit

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Embodiment Construction

[0031] Audio power amplifiers usually include at least one output stage, and the output stage includes a differential amplifier circuit (hereinafter referred to as the differential circuit). The ideal differential circuit parameters are completely symmetrical. When the input signal is zero, the double-ended output voltage is also Zero, but in the actual circuit, due to the uncertainty of each process of the manufacturing process, there is a limited mismatch between devices with the same nominal name. This mismatch causes the output to be not completely zero when the input is zero, that is, the offset of the differential amplifier. . The device mismatch caused by the process is very dependent on the manufacturing process and layout. MOS transistors with exactly the same parameters have random slight changes in gate size during the manufacturing process, so there is a mismatch in length and width.

[0032] Based on the above analysis, the technical solution of the present invent...

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Abstract

A circuit for suppressing audio output noise and an audio output circuit, the circuit for suppressing audio output noise includes: a detection circuit adapted to detect the current output value of an output stage of an audio power amplifier; a control circuit adapted to output at least one control signal , the control signal is related to the detection result of the detection circuit; the compensation circuit is adapted to compensate at least one output stage of the audio power amplifier including a differential circuit based on the control signal output by the control circuit, so that The parameters of the differential circuit are symmetrical or tend to be symmetrical. The technical scheme of the present invention compensates the differential circuit in the output stage of the audio power amplifier based on the current detection result of the output stage, has a wider application range and is simple to realize the circuit.

Description

technical field [0001] The invention relates to the technical field of audio output, in particular to a circuit for suppressing audio output noise and an audio output circuit. Background technique [0002] When the audio power amplifier used to drive the speakers is turned on or off, audio transients can produce pops or other strange transient noises in the speakers. In order to suppress the transient noise of the audio output, the existing method is to add a noise suppression circuit at the output of the audio power amplifier to solve the output transient caused by the characteristics of the device in the output circuit connected between the audio power amplifier and the speaker. state noise. [0003] However, the existing noise suppression circuit is designed based on the analysis of the output circuit, and there are many types of audio power amplifiers, such as Class A (Class A), Class B (Class B), Class AB (Class AB) , Class D (Class D), Class G (Class G) and Class H (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 张洵
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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