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Audio power amplifier with improved low frequency performance

A technology of power amplifier and audio power, which is applied in the direction of low-frequency amplifiers, etc., and can solve problems such as expensive

Active Publication Date: 2010-09-29
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, larger capacitors are themselves more expensive

Method used

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  • Audio power amplifier with improved low frequency performance
  • Audio power amplifier with improved low frequency performance
  • Audio power amplifier with improved low frequency performance

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] image 3 The circuit structure of the audio power amplifier device with improved low frequency performance of the present invention is shown. See image 3, the audio power amplifier device receives the input signal Vin provided by the front stage, amplifies or attenuates the input signal Vin, and the obtained output signal is loaded on the speaker 109 .

[0040] The input signal Vin is applied to the inverting input terminal of the power amplifier module 101 through the resistor R1 , and the common-mode reference voltage Vcm is applied to the non-inverting input terminal of the power amplifier module 101 . The power amplifier module 101 adopts a single power supply mode and is powered by the power supply VCC. One output signal Vx of the power amplifier module 101 is fed back to the inverting input terminal of the amplifier through the resistor...

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Abstract

The invention discloses an audio power amplifier for improving the performance of the low frequency, which reduces the restrain of the audio power amplifier on the low frequency signal, also decreases the value of the separating capacitance, meanwhile illdefinedly adds the complexity of the system. The technical scheme is that, the audio power amplifier comprises a power amplifier module, supplying power through a single power, with a common mode input end, an inverted input end and an output end, wherein the inverted input end is connected with a first resistance, and the output end is connected with a speaker through the separating capacitance; a feedback channel module, connected between the output end of the power amplifier module and the inverted input end with a second resistance; aresistance-capacitance circuit connected with the second resistance, wherein the resistance-capacitance circuit is composed of a third resistance and a separating capacitance connected in parallel, to counteract the low frequency gain attenuation of the power amplifier module.

Description

technical field [0001] The present invention relates to a power amplifying device, in particular to an audio power amplifying device in mobile terminal equipment. Background technique [0002] In mobile terminal equipment, a single-supply audio power amplifier device is generally used. figure 1 A conventional single-supply audio power amplifier device is shown inverting and amplifying an input signal to drive a speaker load. The audio power amplifier module 101 is connected with the single power supply VCC, and the audio power amplifier module 101 includes an inverting input terminal for receiving the input signal Vin provided by the previous stage and a non-inverting input terminal for receiving the common mode reference voltage Vcm, and an output of the output signal Terminal Vx. After the audio power amplifier module 101 amplifies or attenuates the input signal Vin through the input resistor R1 and the feedback resistor R2, the obtained output signal Vx is loaded on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/181
Inventor 张洵傅志军
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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