Class d audio power amplifier for suppressing noise and its audio signal processing method

A technology of audio power and amplifier, which is applied in the field of class D audio power amplifier and its audio signal processing, which can solve the problems of distortion, power supply noise aggravation, switch machine noise increase, etc., and achieve the effect of reducing zero-crossing distortion and crosstalk noise

Active Publication Date: 2016-03-09
北京中科微投资管理有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fixed delay Δt of this improved Class-D audio amplifier design has always existed after the chip is started. Although Δt reduces the signal distortion when the small signal is input, the distortion and power supply noise are still at a certain level when the large signal is input. At the same time, this improvement also led to an increase in the switching noise (POP and CLICK) of the Class D audio amplifier at the moment of power-on and power-off

Method used

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  • Class d audio power amplifier for suppressing noise and its audio signal processing method
  • Class d audio power amplifier for suppressing noise and its audio signal processing method
  • Class d audio power amplifier for suppressing noise and its audio signal processing method

Examples

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Embodiment 1

[0036] Such as image 3 As shown, according to a specific embodiment of the class D audio power amplifier of the present invention, the class D audio power amplifier includes an integrator 20, a comparator, a driver, a power switching element, and a feedback network. The class D audio power amplifier also includes a voltage-controlled delay circuit 5 for controlling signal delay so as to suppress system crosstalk noise and switching noise and a signal amplitude detection module 50 .

[0037] The input terminal input of the voltage-controlled delay circuit 5 is used as the square wave CLK of the reference wave, and the control terminal of the voltage-controlled delay circuit 5 inputs the control control signal. The control signal of the voltage-controlled delay circuit 5 can be a switch enabling signal, a signal Amplitude identification signal or enabling control signal in other systems. In this embodiment, the control signal of the voltage-controlled delay circuit 5 uses a si...

Embodiment 2

[0061] Such as Image 6 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the input terminal of the voltage-controlled delay circuit 5 inputs a triangular wave as a reference wave, and the control terminal control input of the voltage-controlled delay circuit 5 is input by The control signal of the signal amplitude detection module output, the output end of the voltage-controlled delay circuit 5 outputs a delayed triangular wave, and the delayed triangular wave is a delayed triangular wave; The square wave is input to the inverting input of the second comparator 31; the first output of the integrator 20 is connected to the non-inverting input of the first comparator 30, and the second output of the integrator 20 is connected to the non-inverting input of the second comparator 31. input connection;

Embodiment 3

[0063] Such as Figure 7 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the input end of the voltage-controlled delay circuit 5 is connected to the output end of the first comparator 30, and the control of the voltage-controlled delay circuit 5 Input the control signal output by the signal amplitude detection module, the output of the voltage-controlled delay circuit 5 is connected to the input of the first driver 40; the output of the second comparator 31 is connected to the input of the second driver 41.

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Abstract

The invention discloses a class D audio power amplifier for suppressing noise and an audio signal processing method thereof. The class D audio power amplifier at least comprises an integrator, a comparator, a driver, a power switch element and a feedback network and further comprises a voltage-controlled delay circuit for controlling signal delay and a signal amplitude detecting module for providing control signals for the voltage-controlled delay circuit. As the voltage-controlled delay circuit and the signal amplitude detecting module are added, zero-crossing distortion and crosstalk noise of the class D audio power amplifier are reduced, startup and shutdown noise (POP and CLICK) is reduced, THD+N parameters (total harmonic distortion plus noise) are reduced and the capability of power supply rejection (PSR) and the overall audio quality of the amplifier are improved. By taking square-wave modulating signals as carrier signals of audio input signals, a triangular wave generating circuit in the existing class D audio power amplifier is omitted, the area of a chip is saved and the manufacturing cost of the chip is saved.

Description

technical field [0001] The invention relates to the technical field of audio power amplification, in particular to a Class D audio power amplifier for suppressing noise and an audio signal processing method thereof. Background technique [0002] Such as figure 1 As shown, a Class D audio amplifier uses a high frequency square wave modulation carrying an audio input signal Vin to control a power switching element. The power switching element drives the load speaker to produce sound. The size of the power switching element used in the class D audio amplifier in the prior art is generally large, and the parasitic capacitance of the gate is also large due to the large size, resulting in a large distortion of the small audio input signal Vin. Or when the audio input signal Vin is zero, crosstalk noise is generated due to the simultaneous switching of the power switching elements. [0003] Such as figure 2 As shown, when the audio input signal Vin is zero, since the improved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F3/217
Inventor 赵野黑勇
Owner 北京中科微投资管理有限责任公司
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