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D-genus audio power amplifier

An audio power and amplifier technology, applied in the field of class D audio power amplifiers, can solve the problems of class D amplifier size and cost reduction, and achieve the effect of improving power supply rejection ratio, reducing electromagnetic interference, and improving common mode rejection ratio

Inactive Publication Date: 2009-06-24
北京东微世纪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is still necessary to further reduce electromagnetic interference, and require further reduction in size and cost of Class D amplifiers

Method used

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  • D-genus audio power amplifier
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Embodiment Construction

[0024] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0025] The frequency spread self-oscillating class D amplifier according to the embodiment of the present invention can be realized as an integrated chip based on CMOS technology or BiCMOS technology.

[0026] figure 2 is a block diagram showing the structure of a spread spectrum self-oscillating class D amplifier according to an embodiment of the present invention. refer to figure 2 , the spread frequency self-oscillating class D amplifier includes a preamplifier 201 , a modulator 202 , a logic control and drive circuit 203 , a bridge power switch 204 and a protection circuit 205 . In the class D amplifier according to the present invention, the reference voltage V REF ...

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Abstract

The invention provides a class D audio power amplifier and a modulator for class D audio power amplifier; the modulator comprises a first transconductance amplifier, a second transconductance amplifier, a capacitor and a comparator unit; wherein, the negative input end of the first transconductance amplifier is used for receiving a first audio signal and a second feedback signal of a class D amplifier, and the positive input end thereof is used for receiving reference input voltage; the negative input end of the second transconductance amplifier is used for receiving a second audio signal contrary to the first audio signal and a first feedback signal of the class D amplifier, and the positive input end thereof is used for receiving reference input voltage; the capacitor is connected between the output ends of the first transconductance amplifier and the second transconductance amplifier, and is combined with the first transconductance amplifier and the second transconductance amplifier to perform integral towards the output signal of the first transconductance amplifier and the output signal of the second transconductance amplifier; the comparator unit is used for respectively comparing the output signal of the first transconductance amplifier and the output signal of the second transconductance amplifier with the output signal of a first current source and the output signal of a second current source, and outputting a first control signal, a second control signal, a third control signal and a fourth control signal which are modulated into digital signals.

Description

technical field [0001] The present invention relates to audio frequency power amplification, and more specifically relates to a class D audio frequency power amplifier capable of reducing electromagnetic interference (EMI) and spreading self-oscillation without a filter. Background technique [0002] Class D audio power amplifiers (hereinafter referred to as Class D amplifiers) are the same as traditional Class A, Class B, and Class AB amplifiers. audio input signal. However, Class D amplifiers have significant advantages in many applications over Class A, B, and AB amplifiers because the low power dissipation generates less heat, saves printed circuit board (PCB) area and cost, and extends portable System battery life. [0003] Specifically, the Class D audio amplifier adopts the pulse width modulation technique PWM (Pulse WidthModulation) or the pulse duty ratio modulation technique PDM (Pulse Duty cycle Modulation), that is, the amplitude of the analog audio signal is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
Inventor 杨勇刚
Owner 北京东微世纪科技有限公司
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