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    • 125. 发明授权
    • Light receiving amplifying device
    • 光接收放大装置
    • US6137101A
    • 2000-10-24
    • US132412
    • 1998-08-11
    • Naruichi YokogawaTakanori OkudaTakayuki Shimizu
    • Naruichi YokogawaTakanori OkudaTakayuki Shimizu
    • H03F3/08H04B10/116H04B10/40H04B10/50H04B10/60H01J40/14
    • H04B10/114
    • A light receiving amplifying device includes a light receiving device for outputting a light signal current which varies with a quantity of received light, a load resistor connected with the light receiving device in series, for generating a detected voltage which varies with the light signal current, and a low frequency current bypass circuit for preventing the detected voltage from being saturated when the detected voltage has a frequency in a low frequency band. The low frequency current bypass circuit is connected with the load resistor in parallel and has an input impedance varying with a frequency of the detected voltage. The device further includes a transimpedance amplifying circuit (inverting amplifying circuit) for transforming an impedance of the detected voltage, and a capacitor for coupling the low frequency current bypass circuit and the transimpedance amplifying circuit (inverting amplifying circuit). This makes it possible, with a relatively simple circuit and arrangement in an infrared communication receiver, to lower noises of the light receiving amplifying device while maintaining an operational range with respect to a DC photoelectric current.
    • 光接收放大装置包括:光接收装置,用于输出随接收光量变化的光信号电流;串联连接光负载电阻器的负载电阻,用于产生随光信号电流变化的检测电压; 以及低频电流旁路电路,用于当检测电压具有低频带中的频率时,防止检测电压饱和。 低频电流旁路电路与负载电阻并联连接,输入阻抗随检测电压的频率而变化。 该装置还包括用于变换检测电压的阻抗的跨阻放大电路(反相放大电路),以及用于耦合低频电流旁路电路和跨阻放大电路(反相放大电路)的电容器。 这使得在红外线通信接收机中相对简单的电路和布置可以在保持相对于DC光电流的操作范围的同时降低光接收放大装置的噪声。