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D-type audio power amplifier and audio signal processing method thereof

An audio signal processing and audio power technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve the problems of class D amplifier sound quality effects, error signals, etc., to reduce design difficulty and save area , the effect of improving stability

Active Publication Date: 2012-12-05
JIAXING HEROIC ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The triangular wave is easily affected by the peaks near the trough and the peak to produce false signals, which has a great impact on the sound quality of the class D amplifier

Method used

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  • D-type audio power amplifier and audio signal processing method thereof
  • D-type audio power amplifier and audio signal processing method thereof
  • D-type audio power amplifier and audio signal processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 2 , image 3 As shown, according to a specific embodiment of the Class D audio power amplifier of the present invention and its audio signal processing method, it includes a preamplifier 20, an integrator 40, a comparator 50, a drive circuit 70, a power switch tube 80, and a feedback loop 100.

[0034] The feedback loop 100 includes a first voltage-dividing resistor R6, a second voltage-dividing resistor R5, and a feedback resistor Rf for feeding back the high-voltage drive output signal to the integrator 40 after stepping down the voltage; the second voltage-dividing resistor R6 of the first voltage-dividing resistor One end is connected to the output end of the power switch tube 80, the second end of the first voltage dividing resistor R6 is connected to the feedback resistor Rf; the first end of the second voltage dividing resistor R5 is grounded, and the second end of the second voltage dividing resistor R5 It is also connected to the feedback resisto...

Embodiment 2

[0041] like figure 2 , image 3 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the class D audio power amplifier also includes a square wave generator 10 for generating a square wave, and the output terminal of the square wave generator 10 Connected to the input of the integrator 40.

[0042] Because the square wave generator 10 is used in the class D audio power amplifier of the present invention, the triangular wave generating circuit in the class D audio power amplifier in the prior art is omitted, which saves the area of ​​the chip.

Embodiment 3

[0044] like image 3 , Figure 4 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 2, the difference is that the class D audio power amplifier also includes a common-mode voltage generator 30 for providing a common-mode voltage for the preamplifier 20, and the common The output of the analog voltage generator 30 is connected to the input of the preamplifier 20 . The common-mode voltage Vcm keeps the DC voltage at the static operating point of the single-ended output voltage of the class-D audio power amplifier constant at 1 / 2 of the power supply voltage.

[0045] The common mode voltage generator 30 includes an operational amplifier 400 . The reference voltage Vref is input to the non-inverting input terminal of the operational amplifier 400, and the reference voltage Vref is 1 / 2 of the low voltage supply voltage. The eighth resistor R8 and the ninth resistor R9 are connected in series between the inverting input terminal of the ...

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PUM

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Abstract

The invention discloses a D-type audio power amplifier and an audio signal processing method thereof. The D-type audio power amplifier comprises a preamplifier, an integrator, a comparator, a driving circuit, a power switch pipe, a feedback circuit, a square-wave generator for generating square waves and a common-mode voltage generator for providing common-mode voltage for the preamplifier, the feedback circuit comprises a voltage divider and a feedback resistor, and the voltage divider is used for feeding high-voltage driving output signals after voltage reduction back to the integrator. The voltage divider is used in the feedback circuit in the D-type audio power amplifier to realize voltage reduction, and direct-current gain of the D-type audio power amplifier is constant, so that the direct-current gain cannot be affected by changes of power supply voltage. The circuit structure lowers circuit design difficulty and voltage-resistant requirements of devices needed to choose and improves overall circuit stability.

Description

technical field [0001] The invention relates to the technical field of audio power amplification, in particular to a Class D audio power amplifier and an audio signal processing method thereof. Background technique [0002] In the prior art high-power class-D audio power amplifier, the general power output circuit adopts the power supply voltage, and the pre-stage analog circuit adopts the low-voltage supply voltage. [0003] like figure 1 As shown, the prior art Class D amplifier includes an input audio signal 1, a reference wave generator 2, a pulse width modulator 3, a high voltage power switch 4, a low pass filter 5, a level shifter 6, a feedback network 7 and An audio signal 9 is output. The prior art class D amplifier utilizes a level shifter 6 to step down the power supply voltage of the power output stage to the low voltage supply voltage stage voltage. Generally, the low-voltage supply voltage is a constant voltage generated by the internal LDO. The level shifte...

Claims

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Application Information

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IPC IPC(8): H03F3/217
Inventor 杨志飞黄武康代军赵玉月马琳沈世龙张伟周长胜殷明王圣一
Owner JIAXING HEROIC ELECTRONICS TECH