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PWM die D class amplifier

机译：PWM D类功放

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摘要

PPROBLEM TO BE SOLVED: To solve the problem that distortion and noise are caused by power source noise due to through current of an output stage in a PWM conversion circuit obtaining two kinds of PWM signal outputs, in a PWM-type D-class amplifier supplying amplified power equivalent to a difference of the two kinds of PWM signal outputs converted after re-quantization of a digital input signal by using noise shaping to a load. PSOLUTION: Since a feedback loop of an arithmetic circuit 2 has a large loop gain in a useful band of a digital input signal inputted to an input terminal 1, an output having a reverse characteristic of a circuit composed of an encoding judging unit 15, an error constant generator 16, a multiplier 17 and an adder 18 can be obtained in the useful band for an output of a re-quantizer 3. The characteristic of the circuit represents non-linearity of PWM conversion circuits 5 and 6. Thus, non-linearity in an output re-quantization signal 4 of the re-quantizer 3 is corrected by the reverse characteristic, and distortion and noise which are caused by power source noise due to through current, are reduced. PCOPYRIGHT: (C)2005,JPO&NCIPI

机译：

要解决的问题：解决在PWM型D-型中，获得两种PWM信号输出的PWM转换电路中，由于输出级的直通电流引起的电源噪声引起的失真和噪声的问题。通过对负载进行噪声整形，提供放大的功率，相当于在对数字输入信号进行重新量化后转换的两种PWM信号输出之差的放大功率。

解决方案：由于算术电路2的反馈环路在输入到输入端子1的数字输入信号的有用频带中具有大的环路增益，因此输出具有由编码判断单元组成的电路的反向特性参照图15，可以在有用的频带中获得误差常数发生器16，乘法器17和加法器18，用于再量化器3的输出。该电路的特性表示PWM转换电路5和6的非线性。因此，通过逆特性校正再量化器3的输出再量化信号4中的非线性，并且减小了由于通电流引起的电源噪声所引起的失真和噪声。

版权：（C）2005，JPO＆NCIPI 展开▼

著录项

公开/公告号JP4066893B2

专利类型
公开/公告日2008-03-26

原文格式PDF
申请/专利权人日本ビクター株式会社;
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申请/专利号JP20030181047
发明设计人川崎隆生;大原龍也;豊巻一也;
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申请日2003-06-25
分类号H03F3/217;H03M3/02;
国家 JP
入库时间 2022-08-21 20:18:16

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