会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明申请
    • DIGITAL PWM INPUT D CLASS AMPLIFIER BY PWM NEGATIVE FEEDBACK
    • 数字PWM输入D类放大器通过PWM负反馈
    • WO2003067753A1
    • 2003-08-14
    • PCT/KR2002/001817
    • 2002-09-27
    • DIGITAL AND ANALOG CO., LTDYI, Seung-MokJEONG, Jae-HoonCHO, Goog-ChunCHO, Bo-HyungKIM, Chang-GyunPARK, Jong-Hu
    • JEONG, Jae-HoonCHO, Goog-ChunCHO, Bo-HyungKIM, Chang-GyunPARK, Jong-Hu
    • H03F3/217
    • H03F3/217
    • 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:
    • 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: