CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER
    2.
    发明公开
    CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER 有权
    SCHUNGUNG ZUR VERNDNDUNG DERVERSTÄRKUNGEINESVORVERSTÄRKERS

    公开(公告)号:EP1653607A1

    公开(公告)日:2006-05-03

    申请号:EP03817770.5

    申请日:2003-07-30

    IPC分类号: H03G3/20 H03F3/08 H04B10/06

    摘要: A gain switching circuit (3) that switches a conversion gain of a preamp (2), which outputs a voltage signal upon amplifying an output current of a photo-detecting element (1) that converts a burst-form optical signal into an electrical signal and with which a series circuit, formed with a first resistor (6) and a first switching element (9), and a series circuit, formed with a second resistor (7) and a second switching element (10), are connected in parallel to a feedback resistor (2B), generates an operating signal for closing the first switching element (9) within a first gain switching period and generates an operating signal for closing the second switching element (10) within a second gain switching period.

    摘要翻译: 一种增益切换电路(3),其切换前置放大器(2)的转换增益,该放大器(2)的转换增益在放大光电检测元件(1)的输出电流时输出,该光检测元件将突发形式的光信号转换为电信号 与第一电阻器(6)和第一开关元件(9)形成的串联电路和形成有第二电阻器(7)和第二开关元件(10)的串联电路并联连接 到反馈电阻器(2B),产生用于在第一增益切换周期内闭合第一开关元件(9)的操作信号,并产生用于在第一增益切换周期内关闭第二开关元件(10)的操作信号