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Anti-sound break circuit for D-class power amplifier chip

A power amplifier chip, anti-broken sound technology, applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, electrical components, etc., can solve problems affecting the sound quality of class D power amplifier chips, and improve internal work Effects of environment, impact reduction, duty cycle change mitigation

Active Publication Date: 2015-07-08
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an anti-broken sound circuit for class D power amplifier chips, which can solve the problem of EMI (electromagnetic interference) characteristics and Technical Problems of Overall Sound Quality of Class D Power Amplifier Chips

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  • Anti-sound break circuit for D-class power amplifier chip
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  • Anti-sound break circuit for D-class power amplifier chip

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Embodiment Construction

[0030] See Figure 4 to Figure 8 In order to better understand the technical solutions of the present invention, the inventors of the present invention are described in detail below through specific embodiments in conjunction with the accompanying drawings:

[0031] See Figure 4 An anti-sound-breaking circuit for class D power amplifier chips of the present invention includes an amplifier 2, a PWM module 3, a broken-sound detection circuit 5, a correction circuit 6, and two continuously adjustable resistors 1. Two continuously adjustable resistors 1 are correspondingly arranged at the two input terminals of the amplifier 2. The two output terminals of the amplifier 2 are correspondingly connected to the two input terminals of the PWM module 3. The two output terminals of the PWM module 3 are correspondingly connected to the two input terminals of the broken sound detection circuit 5, and the output terminal of the broken sound detection circuit 5 is connected to the correction c...

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Abstract

The invention discloses an anti-sound break circuit for a D-class power amplifier chip. The anti-sound break circuit comprises an amplifier, a pulse width modulation (PWM) module, a broken sound detection circuit, a correcting circuit and two continuous adjustable resistors, wherein the two continuous adjustable resistors are correspondingly arranged at the two input ends of the amplifier; a fourth switch, a second capacitor and a first capacitor are arranged at the output end of the correcting circuit, wherein the second capacitor and the first capacitor are respectively grounded, the second capacitor is connected with the first capacitor through the fourth switch, the capacitance value of the second capacitor is less than that of the first capacitor; the first capacitor is simultaneously connected with the two continuous adjustable resistors, and produces continuously variable correction voltage Vc, so that the resistance value of the two continuous adjustable resistors can be controlled. The anti-sound break circuit has the technical effects that the continuous adjustment of the amplification gain of the amplifier is realized, and the D-class power amplifier chip can be ensured to keep good tone quality in the broken sound correction process.

Description

Technical field [0001] The invention relates to an anti-breaking sound circuit for class D power amplifier chips in the field of integrated circuits. Background technique [0002] When the traditional Class D power amplifier is working, the power amplitude value of the audio input signal often exceeds the power amplitude value of the triangular wave signal input to the PWM module because the audio input signal is too large or the power supply voltage is reduced. The triangular wave signal is used to sample the audio input signal. At this time, after the audio input signal is filtered by the loudspeaker, severe clipping will occur, that is, the sound is broken. The sound quality deteriorates and the THD (total harmonic distortion) increases, and it can even damage the class D power amplifier or speakers. Therefore, the design in the class D power amplifier chip must prevent the above from happening. [0003] See figure 1 , The utility model patent application number 201020249702.0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217H03F1/26
Inventor 刘燕涛
Owner SHANGHAI BEILING