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Class-D amplifier

A class D amplifier and integrator technology, which is applied in the direction of amplifier, amplification control, improving amplifier to reduce nonlinear distortion, etc., can solve the problem of output signal waveform distortion of class D amplifier, and achieve the effect of preventing waveform distortion

Inactive Publication Date: 2010-09-15
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a configuration, the input signal to the error integrator is clamped by the clamp circuit, and thus there is a problem that a large waveform distortion appears in the output signal of the class D amplifier

Method used

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Examples

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Embodiment Construction

[0023] The embodiments of the present invention will be discussed below with reference to the drawings:

[0024] figure 1 Is a circuit diagram showing the configuration of a class D amplifier according to an embodiment of the present invention. The class D amplifier is a circuit for generating digital signals VOp and Von, the digital signals VOp and Von having two positive and negative phase input analog signals VIP and VIn response to input to the input terminals 101p and 101n The circuit is used to output digital signals VOp and VOn from the output terminals 102p and 102n. A filter and a load 200 such as a microphone coil are arranged between the output terminals 102p and 102n. The resistors R11, R12, R13, R14, and R15 are arranged in series between the input terminal 101p and the output terminal 102n. The resistors R21, R22, R23, R24, and R25 are arranged in series between the input terminal 101n and the output terminal 102p. The resistance value of the resistor satisfies t...

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PUM

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Abstract

A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation circuit that outputs a digital signal having a pulse width corresponding to a level of the integration value signal, an output buffer that drives a load based on the digital signal, a feedback section thatfeeds an output signal of the output buffer into the differential integrator as the feedback signal, a clamp section that performs a clamping of limiting the level of the integration value signal within a specified level range, an attenuation section that attenuates the level of the input signal to be input to the differential integrator in response to an attenuation command, and an attenuation control section that outputs the attenuation command to the attenuation section in response to the clamping performed by the clamp section.

Description

Technical field [0001] The present invention relates to a class D amplifier suitable for power amplifiers of audio equipment and the like. Background technique [0002] The class D amplifier is an amplifier for generating a pulse train having a pulse width or pulse time density demodulated in response to an input signal and driving a load according to the pulse train. Class D amplifiers are often used as power amplifiers for driving loudspeakers in audio equipment and the like. Patent Documents 1 to 3 each disclose a class D amplifier including: an error integrator for integrating the difference between an input signal and a feedback signal output from the class D amplifier; and a pulse width modulation circuit for A pulse having a pulse width corresponding to the level of the integrated value signal output from the error integrator is generated. Class D amplifiers drive the load based on the output pulse of a pulse width modulation circuit. [0003] [Patent Document 1] JP-A-200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03F1/32
CPCH03F3/2173H03G3/3021H03F1/3205
Inventor 土屋裕利
Owner YAMAHA CORP
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