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21. 发明专利

JPS5950632A Photoelectric conversion circuit 失效
标题翻译：光电转换电路
公开(公告)号：JPS5950632A
公开(公告)日：1984-03-23
申请号：JP16141982
申请日：1982-09-14
申请人： Nippon Telegr & Teleph Corp
发明人： OKADA KENJI , TOKURA NOBUYUKI , HIGASHIYAMA KOUJI
IPC分类号： H01L31/02 , H04B10/07 , H04B10/293 , H04B10/564 , H04B10/572 , H04B10/69
CPC分类号： H04B10/691
摘要： PURPOSE:To make effective operation at a wide dynamic range possible, by bringing automatically an input impedance higher when the level of an optical signal input is low and said impedance lower when the level is high. CONSTITUTION:A resistor 4 in a feedback circuit is a variable resistance element whose resistance value is changed depending on the flowing current therethrough. When the optical signal input level of a photodiode 1 is low, a current flowing to the resistor 4 is small, a resistance value Rf is high, an input impedance of a negative feedback amplifier is high and a large voltage is generated at the input of an smpligirt 3. When the input level becomes higher, the current of the resistor 4 is large and the resistance value Rf is lower. Thus, the input impedance of the negative feedback amplifier is low, the input voltage to the amplifier 3 is small, the gain of the negative feedback amplifier is decreased and the saturation region of the amplifier 3 is increased. Thus, the input impedance of the negative feedback amplifier is changed automatically, the low signal is amplified suitably and the amplifier is not saturated even if the input signal level is high.
摘要翻译：目的：为了在宽动态范围内进行有效的操作，当光信号输入电平低时，自动输入阻抗较高，当电平较高时阻抗较低。构成：反馈电路中的电阻器4是可变电阻元件，其电阻值根据流过的电流而改变。当光电二极管1的光信号输入电平低时，流向电阻器4的电流小，电阻值Rf高，负反馈放大器的输入阻抗高，在输入端产生大的电压当输入电平变高时，电阻器4的电流大，电阻值Rf较低。因此，负反馈放大器的输入阻抗低，放大器3的输入电压小，负反馈放大器的增益减小，放大器3的饱和区域增加。因此，负反馈放大器的输入阻抗自动改变，低信号被适当放大，即使输入信号电平较高，放大器也不饱和。

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