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2. 发明公开

EP1239585A1 DIFFERENTIAL AMPLIFIER 有权
标题翻译： DIFFERENTIALVERSTÄRKER
公开(公告)号：EP1239585A1
公开(公告)日：2002-09-11
申请号：EP00978050.3
申请日：2000-12-01
申请人： YAMAHA CORPORATION
发明人： MAEJIMA, Toshio, c/o Yamaha Corporation
IPC分类号： H03F3/45 , H03F3/30
CPC分类号： H03F3/45179 , H03F3/3028 , H03F3/45192 , H03F2203/45028 , H03F2203/45292 , H03F2203/45651
摘要： A differential amplifier circuit of the present invention comprises an input circuit 10 for producing a difference voltage signal between a positive input signal and a negative input signal, a feedback bias circuit 20 for inputting the difference voltage signal supplied from the input circuit 10 to provide a bias voltage corresponding to the difference voltage signal and for performing a feedback control on the bias voltage by feeding back an output current, an output circuit 30 for supplying a load with the output current corresponding to the bias voltage, and a current detection circuit 40 for detecting the output current to provide it to the feedback bias circuit 20. The differential amplifier circuit performs class-AB amplification in such a way that the bias voltage provides a current value close to zero when the difference voltage signal is substantially zero.
摘要翻译：本发明的差分放大电路包括用于产生正输入信号和负输入信号之间的差分电压信号的输入电路10，用于输入从输入电路10提供的差分电压信号的反馈偏置电路20，对应于差分电压信号的偏置电压，并且通过反馈输出电流来执行对偏置电压的反馈控制;输出电路30，用于向负载提供与偏置电压相对应的输出电流;以及电流检测电路40，用于检测输出电流以将其提供给反馈偏置电路20.差分放大器电路以这样的方式执行AB类放大，使得当差分电压信号基本为零时，偏置电压提供接近零的电流值。

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