Method of attenuating zero crossing distortion and noise in amplifier, and amplifier

An amplifier and noise technology, applied in the direction of improving amplifiers to reduce noise effects, improving amplifiers to reduce nonlinear distortion, amplifiers, etc., can solve problems such as low complexity

Inactive Publication Date: 2004-03-17
得州仪器丹麦有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are especially unsuitable for home amplifiers, where low complexity and common design criteria for most loads are important

Method used

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  • Method of attenuating zero crossing distortion and noise in amplifier, and amplifier
  • Method of attenuating zero crossing distortion and noise in amplifier, and amplifier
  • Method of attenuating zero crossing distortion and noise in amplifier, and amplifier

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Embodiment Construction

[0034] exist figure 1 In , reference 1 denotes an audio signal generator generating an audio signal 15, while reference 2 and reference 3 denote an inverted block and a non-inverted block, respectively. The inverted and non-inverted signals are pulse width modulated at digital or analog pulse width modulators 4 and 5 in a known manner.

[0035] The signal generated in the pulse width modulator whose output signal is used to control the half bridges (switch banks) 8 and 9. figure 1 The system in works in BD class operation. The pulse-width-modulated power signal, which for example describes an audio signal represented by high-frequency pulses, is demodulated and supplied to a load, indicated here by reference 10 .

[0036] figure 2 It is schematically shown how the pulse width modulation in the pulse width modulators 4 and 5 arises as a function of the signal with non-inverted and inverted signal parts, respectively. Note that the pulse edges of the two outputs 12 and 13 o...

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Abstract

According to the invention, a method and an amplifier e.g. of the class D type, in particular connected as class BD, wherein an audio signal is pulse-with modulated in that two sets of switches are adapted to make and break signal paths transferring pulses representing the non-inverted or inverted part of the audio signal, comprise attenuating noise and zero crossing distortion which occur because of crosstalk between modulator and control circuit halves in the amplifier. Noise and zero crossing distortion are attenuated by delaying the pulses which represent the non-inverted part and the inverted part, respectively, of the audio signal relative to each other, when the audio signal is in the vicinity of the value 0, thereby achieving modulation of the audio signal which contains characteristics from pulse with modulation of both class AD and BD type. The advantage of this is that at low signal levels the amplifier obtains the linear properties of the class AD amplifiers at zero crossing and the low noise of the class BD amplifier. The pulse-with modulation type is here called class ABD.

Description

technical field [0001] The invention relates to a method for reducing noise and zero-crossing distortion in an amplifier and an amplifier. Background technique [0002] Traditional amplifiers for audio use amplify the audio signal and create a sound image on the speakers. However, the power efficiency of these amplifiers is not high. Therefore, amplifiers are constructed according to other principles. [0003] These high-efficiency amplifiers include, for example, pulse-width modulation-based amplifiers, which are also known as class-D amplifiers. [0004] This amplifier consists of a pulse-width modulator, one or more sets of switches, and a low-pass filter. [0005] The principle of a class D amplifier is that one or more sets of switches are switched on and off according to the amplitude of a signal, such as an audio signal. The information of the audio signal is thereby converted into a plurality of pulses which correspond strictly to the information of the audio sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03F1/26H03F3/217
CPCH03F2200/372H03F1/26H03F3/2173H03F1/32H03F2200/351H03F2200/03
Inventor 尼尔斯·安德斯克夫拉斯·里斯博
Owner 得州仪器丹麦有限公司
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