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Audio processing circuit and terminal equipment

An audio processing and circuit technology, used in audio amplifiers, electrical components, low-frequency amplifiers, etc., can solve problems such as op amp path noise, and achieve the effect of suppressing POP noise and reducing POP noise.

Active Publication Date: 2019-01-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application provides an audio processing circuit and terminal equipment, which can solve the problem of POP noise generated during the establishment of the operational amplifier channel in the prior art

Method used

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  • Audio processing circuit and terminal equipment
  • Audio processing circuit and terminal equipment
  • Audio processing circuit and terminal equipment

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Embodiment Construction

[0065] The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device comprising a sequence of steps or circuits need not be limited to the expressly listed those steps or circuits, but may include other steps or circuits not explicitly listed or inherent to these processes, methods, products or devices, the division of circuits presented in this application is only a logical division , there may be...

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PUM

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Abstract

The invention discloses an audio processing circuit and terminal equipment. The circuit includes a cascade operational amplifier circuit, an output node and a pull-down circuit; the cascade operational amplifier circuit is used for amplifying input voltage and outputting the amplified voltage to the output node; the cascade operating amplifier circuit includes a first operational amplifier circuitand a second operational amplifier circuit; the first operational amplifier circuit is the pre-stage operation amplifier of the second operational amplifier circuit, and includes a parallel main operational amplifier and auxiliary operational amplifier; one end of the pull-down circuit is coupled to the output node, and the other end of the pull-down circuit is connected to the ground or a common-mode voltage module; the pull-down circuit is used for pulling down the voltage of the output node after the first operational amplifier circuit is turned on; and the second operational amplifier circuit is used for controlling the voltage gain of the auxiliary operational amplifier to gradually change from low to high after turning on the operational amplifiers, so that the voltage of the outputnode can be gradually changed from low to high by following the gradual change of an output resistor. Through the circuit, POP noise can be effectively inhibited during operational amplifier pathwayestablishment.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to an audio processing circuit and terminal equipment. Background technique [0002] After the audio circuit is powered on, the establishment of the op amp path will involve the establishment of the op amp operating point and the establishment of the op amp path. Since each operational amplifier circuit in an audio circuit is not an ideal device, there may be an offset voltage in each operational amplifier circuit at each level. The voltage bias generated by the front-stage op-amp circuit will be transmitted to the subsequent-stage op-amp circuit, and there will be a voltage difference between the output voltage of the front-stage op-amp circuit and the ideal voltage, which will lead to the establishment of the operating point of the op amp or the operation of the op amp. During the channel establishment process, the output node generates an offset voltage, which finally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/02
CPCH04R3/02H03F3/72H03F3/45475H03F1/305H03F2200/03H03F1/301H03F3/187H03F2200/231H03F2200/312H03F2200/396H03F2200/421H03F2200/381H03F1/3264H03F3/04
Inventor 尹德杨李君李定杜帅
Owner HUAWEI TECH CO LTD