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1. 发明申请

WO2003067753A1 DIGITAL PWM INPUT D CLASS AMPLIFIER BY PWM NEGATIVE FEEDBACK 审中-公开
标题翻译：数字PWM输入D类放大器通过PWM负反馈
公开(公告)号：WO2003067753A1
公开(公告)日：2003-08-14
申请号：PCT/KR2002/001817
申请日：2002-09-27
申请人： DIGITAL AND ANALOG CO., LTD , YI, Seung-Mok , JEONG, Jae-Hoon , CHO, Goog-Chun , CHO, Bo-Hyung , KIM, Chang-Gyun , PARK, Jong-Hu
发明人： JEONG, Jae-Hoon , CHO, Goog-Chun , CHO, Bo-Hyung , KIM, Chang-Gyun , PARK, Jong-Hu
IPC分类号： H03F3/217
CPC分类号： H03F3/217
摘要： Disclosed is a digital PWM input D class amplifier by PWM negative feedback. The amplifier includes: digital modulation part for modulating PCM signal of input audio to PWM signal; pulse width generating and correcting part for comparing difference between the PWM signal and output signal negatively fed back, with PWM ramp signal to generate PWM switching signal; output part for generating an amplified output audio signal in response to the PWM switching signal of the pulse width generating and correcting part; and voltage negative feedback loop for negatively feeding back signal of the output part and decreasing a harmonic component to provide the signal to the pulse width generating and correcting part. Thus, the invention compares the negative feedback signal with positive/negative (+/-) saw tooth PWM ramp signal to control On/Off time period of switching transistor and the PWM pulse width and thereby enhance the linearity of the output PWM:
摘要翻译：公开了通过PWM负反馈的数字PWM输入D类放大器。放大器包括：用于将输入音频的PCM信号调制为PWM信号的数字调制部分; 脉冲宽度产生和校正部分，用于比较PWM信号和负反馈的输出信号之间的差异，并用PWM斜坡信号产生PWM开关信号; 输出部分，用于响应脉冲宽度产生和校正部分的PWM切换信号产生放大的输出音频信号; 和电压负反馈环路，用于对输出部分的信号进行负反馈，并减少谐波分量，以向脉冲宽度产生和校正部分提供信号。因此，本发明将负反馈信号与正/负（+/-）锯齿PWM斜坡信号进行比较，以控制开关晶体管的开/关时间和PWM脉冲宽度，从而提高输出PWM的线性度：

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