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Automatic correction circuit for offset voltage outputted by D-type power amplifier circuit

A power amplifier circuit and offset voltage technology, applied in the circuit field, can solve the problems of POP noise and cannot effectively suppress circuit POP noise, and achieve the effect of reducing POP noise

Pending Publication Date: 2020-02-28
南通首微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, according to the method disclosed in the above literature, the researchers further found that the above method cannot effectively suppress the POP noise caused by the adaptation of the circuit itself
That is to say, in the prior art, during the power-on and start-up process of the class D power amplifier, due to the influence of manufacturing process deviation and device mismatch, there will still be a DC voltage difference between the two output terminals in the absence of an input signal. , resulting in POP noise at power-on

Method used

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  • Automatic correction circuit for offset voltage outputted by D-type power amplifier circuit
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  • Automatic correction circuit for offset voltage outputted by D-type power amplifier circuit

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0026] The terms "first", "second", "third", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily to describe a specific order or sequentially. It should be understood that the items so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive in...

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Abstract

The invention discloses an automatic correction circuit for an offset voltage outputted by a D-type power amplifier circuit. The circuit can automatically detect the deviation of the output direct-current voltage when the D-type power amplifier circuit starts to work and correct the deviation through a control circuit, thereby reducing the POP noise during startup.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to an automatic correction circuit for output offset voltage of a Class D power amplifier circuit. Background technique [0002] Class D power amplifier circuit is a switch-type power amplifier circuit. Its working principle is based on PWM mode. It compares the audio signal with a triangular wave, and outputs a PWM waveform whose pulse width is proportional to the amplitude of the audio signal. Then, the amplitude of the PWM waveform Amplify, and then restore the amplified PWM waveform to an amplified audio signal after filtering. Compared with linear power amplifier circuits, Class D power amplifier circuits have the characteristics of high efficiency and less heat generation. Therefore, Class D power amplifier circuits are widely used in consumer electronics such as smart TVs and smart phones. [0003] Since the audio input of the class D power amplifier circuit must work at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
CPCH03F3/2171
Inventor 李国勇李路樊大伟
Owner 南通首微电子有限公司