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    • 22. 发明授权
    • Optical receiver with extended dynamic range
    • 具有扩展动态范围的光接收机
    • US5008524A
    • 1991-04-16
    • US408626
    • 1989-09-18
    • Jorg ReutterFrank Krause
    • Jorg ReutterFrank Krause
    • H03F3/08H04B10/69
    • H04B10/6911
    • To extend the dynamic range of an optical receiver with a transimpedance amplifier (TIV), it is known to operate the photodiode (PD) as an AC source at high light levels by using a DC-limiting element in the DC circuit of the photodiode, and to convert, by means of an AC circuit, the alternating voltage into an alternating current serving as the input current for the transimpedance amplifier (TIV), which lies within the permissible range. According to the invention, the AC circuit (C.sub.s, R.sub.s) runs from the photodiode terminal (2) not connected to the transimpedance amplifier input to the output (U.sub.a) of the transimpedance amplifier, whereby an extension of the dynamic range is achieved. The current-limiting element is preferably a transistor circuit (R.sub.E, T) connected as a constant-current source.
    • 为了利用跨阻抗放大器(TIV)来扩展光接收器的动态范围,已知通过在光电二极管的DC电路中使用DC限制元件,将光电二极管(PD)作为AC电源工作在高光电平, 并且通过AC电路将交流电压转换成用作跨导放大器(TIV)的输入电流的交流电流,其处于允许范围内。 根据本发明,AC电路(Cs,Rs)从未连接到跨阻放大器输入的光电二极管端子(2)延伸到跨阻抗放大器的输出(Ua),从而实现动态范围的延伸。 限流元件优选为作为恒流源连接的晶体管电路(RE,T)。