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1. 发明授权

US5521555A Ultra low noise optical receiver 失效
标题翻译：超低噪声光接收机
公开(公告)号：US5521555A
公开(公告)日：1996-05-28
申请号：US279509
申请日：1994-07-25
申请人： Daniel A. Tazartes , John E. Higbee , Jacque A. Tazartes , Juergen K. P. Flamm , John G. Mark
发明人： Daniel A. Tazartes , John E. Higbee , Jacque A. Tazartes , Juergen K. P. Flamm , John G. Mark
IPC分类号： G01C19/72 , G01J1/44 , H03F3/08
CPC分类号： G01J1/44 , G01C19/721 , H03F3/082
摘要： An amplifier topology for receiving signals output from a fiber optic rotation sensor and producing voltages that may be processed to determine the rotation rate includes a photodiode for receiving an optical signal and producing a corresponding electrical photodiode output signal. An ultra low noise and ultra low capacitance differential input stage is connected to receive the photodiode output signal. An operational amplifier having low noise and ultra-wide bandwidth is connected to the ultra low capacitance differential input stage to receive the output signal therefrom as a driving signal and to produce a low noise output signal. The differential input stage comprises a first amplifier circuit that includes a first transistor connected to the photodetector to act as a first buffer having low noise, low capacitance and unity gain. The first amplifier circuit also includes a second transistor configured as a first voltage follower connected between the output of the first buffer and the operational amplifier to isolate the output of the first buffer from parasitic capacitive loading from a biasing network. The differential input stage further comprises a second a second amplifier circuit that includes a third transistor having an input connected to a reference potential, the third transistor acting as a second buffer having low noise, low capacitance and unity gain. The second amplifier circuit also includes a fourth transistor configured as a second voltage follower connected between the output of the second buffer and the operational amplifier.
摘要翻译：用于接收从光纤旋转传感器输出的信号并产生可被处理以确定旋转速率的电压的放大器拓扑包括用于接收光学信号并产生相应的光电二极管输出信号的光电二极管。连接超低噪声和超低电容差分输入级，以接收光电二极管的输出信号。具有低噪声和超宽带宽的运算放大器连接到超低电容差分输入级，以将其输出信号作为驱动信号接收并产生低噪声输出信号。差分输入级包括第一放大器电路，其包括连接到光电检测器的第一晶体管，以充当具有低噪声，低电容和单位增益的第一缓冲器。第一放大器电路还包括被配置为连接在第一缓冲器的输出端和运算放大器之间的第一电压跟随器的第二晶体管，以将第一缓冲器的输出与偏置网络的寄生电容负载隔离开来。差分输入级还包括第二个第二放大器电路，其包括具有连接到参考电位的输入的第三晶体管，第三晶体管用作具有低噪声，低电容和单位增益的第二缓冲器。第二放大器电路还包括被配置为连接在第二缓冲器的输出端和运算放大器之间的第二电压跟随器的第四晶体管。

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