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Method and apparatus for restraining D-genus power amplifier noise and D-genus power amplifier with noise suppression

A technology of noise suppression and load control, applied in the direction of improving amplifiers to reduce noise influence, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve the problem of increasing the number of chip pins, etc., and achieve the effect of suppressing noise

Inactive Publication Date: 2009-06-24
HANGZHOU MPS SEMICON TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method increases the number of chip pins, and the chip pins need to be modified for different circuits or chips, resulting in certain limitations in its application

Method used

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  • Method and apparatus for restraining D-genus power amplifier noise and D-genus power amplifier with noise suppression
  • Method and apparatus for restraining D-genus power amplifier noise and D-genus power amplifier with noise suppression
  • Method and apparatus for restraining D-genus power amplifier noise and D-genus power amplifier with noise suppression

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Embodiment Construction

[0033] "POP" or "CLICK" noise is caused by the DC reference voltage of the input and output stages of a single-ended Class D power amplifier. In order to minimize this "POP" or "CLICK" noise, special control methods, timing or external "POP" or "CLICK" noise suppression circuits are required to achieve.

[0034] Noise may be caused when PWM (Pulse Width Modulation, pulse width modulation) starts or stops. During the start-up phase of PWM, the frequency domain of the output signal is different from the normal operation state. The frequency range extends around the switching frequency and its image frequency, some of which are below the cutoff frequency of the filter and cannot be filtered by the low-pass filter, thus producing a "POP" or " CLICK" noise. According to the present invention, the best way to solve this problem is to completely mute the speaker for a period of time before the class D amplifier enters normal operation. During this period of time, the class D ampli...

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Abstract

The invention discloses a noise suppression method for class D power amplifier, which includes a step S1 and a step S2; wherein, in step S1, an external enabling signal is received; in step S2, when the state of external enabling signal is changed, an enabling signal for a class D power amplifier is generated according to the external enabling signal; meanwhile, a silencing signal used for controlling the load of a class D power amplifier is generated according to the external enabling signal. The noise suppression method for class D power amplifier can effectively suppress POP or CLICK noise generated in capacitor charge-discharge process without increasing or modifying chip pins.

Description

technical field [0001] The present invention relates to a class D power amplifier noise suppression method and device, in particular to a "POP" or "CLICK" noise suppression method and device for a D class power amplifier, and a class D power amplifier for suppressing noise. Background technique [0002] Class D amplifiers reduce power consumption because the output stage switch tube works in switch mode, so compared with linear amplifiers, such as class A / B amplifiers, class D audio amplifiers have higher efficiency. At present, many Class D audio amplifiers have the problem of transient "POP" or "CLICK" noise. The popping sound produced by the transient impact. This noise is often directly caused by charging / discharging the DC blocking capacitor. Such as figure 1 As shown, an audio signal passes through the capacitor C I and resistor R I Connect to the inverting input of comparator CMP. where C I is the input DC blocking capacitor. The non-inverting input of CMP is ...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/217
Inventor 郎芸萍张军明任远程
Owner HANGZHOU MPS SEMICON TECH
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