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Digital input class-D power amplifier circuit

A power amplifier, digital input technology, applied in the field of electronics, can solve problems such as being susceptible to noise interference, and achieve the effect of low cost and compact structure

Inactive Publication Date: 2012-09-19
成都云溯新起点科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Class D amplifiers use analog voltage signal inputs, which are often susceptible to noise interference

Method used

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  • Digital input class-D power amplifier circuit
  • Digital input class-D power amplifier circuit
  • Digital input class-D power amplifier circuit

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] see figure 2 .

[0013] The class D power amplifier of the present invention includes a digitally controlled current source, an integrator, a comparator and an output stage. The digitally controlled current source converts the input digital signal into a current output to the integrator. The output of the integral is compared with a DC voltage to output a PWM signal. This PWM signal is output driven and filtered to drive the load. The class D power amplifier proposed by the present invention includes a feedback path from the output terminal of the PWM signal to the input terminal of the integrator.

[0014] Specifically, the class D power amplifier includes an integrator 20, a comparator 2, an output stage 3, and a filter 4. The output terminal of the integrator 20 is connected to the inverting input terminal of the comparator 2, and the output terminal of the comparator 2 passes through the output stage 3 Feedback to the input terminal of the integrator 20, there ...

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PUM

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Abstract

The invention discloses a digital input class-D power amplifier circuit, relating to an electronic technology. The power amplifier circuit comprises an integrator, a comparator, an output stage and a filter, wherein the output end of the integrator is connected with the inverted input end of the comparator, the output end of the comparator is fed back to the input end of the integrator through the output stage, a digital control current source is arranged between the input end of the integrator and the input end of the system, the input end of the integrator is also connected with the output end of a clock input circuit, and the clock input circuit is provided with a clock signal input end; and the positive input end of the comparator is grounded. The power amplifier circuit does not comprise a square wave or toothed wave generating circuit, thereby ensuring more compact structure and lower implementation cost.

Description

technical field [0001] The present invention relates to electronic technology, in particular to integrated circuit technology. Background technique [0002] Class D power amplifiers, also known as PWM (Pulse Width Modulation) amplifiers, can be used to amplify audio signals. The class D power amplifier of the prior art usually includes an integrator and a comparator, the output of the integrator is compared with the sawtooth wave or triangle wave output by the oscillator, and the PWM wave is output, such as figure 1 shown. Class D amplifiers use analog voltage signal inputs, which are often susceptible to noise. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a class D amplifier which overcomes input noise and has a simple structure. [0004] The technical solution adopted by the present invention to solve the technical problem is that the digital input class D power amplifier circuit includes an integrator, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217
Inventor 李文昌于廷江黄国辉向本才
Owner 成都云溯新起点科技有限公司