Current mirror correction circuitry
    1.
    发明授权
    Current mirror correction circuitry 失效
    电流镜校正电路

    公开(公告)号:US5757224A

    公开(公告)日:1998-05-26

    申请号:US638419

    申请日:1996-04-26

    IPC分类号: G05F3/26 G05F1/10

    CPC分类号: G05F3/265

    摘要: The present invention is directed toward a circuit for receiving an input current and for producing an output voltage proportional to the input current. The circuit includes a first transistor which receives the input current, and a second transistor connected to the first transistor, wherein the first and second transistors comprise a current mirror topology. A third transistor is connected in series with the first transistor, and an operational amplifier has an output which is connected to the base of the third transistor. The third transistor has a collector coupled to a base junction of the current mirror. The operational amplifier has a positive input terminal coupled to a collector of the second transistor through a first resistor, and a negative input terminal coupled to an emitter of the third transistor through a second resistor, the first and second resistors having substantially similar impedance values.

    摘要翻译: 本发明涉及一种用于接收输入电流并产生与输入电流成比例的输出电压的电路。 电路包括接收输入电流的第一晶体管和连接到第一晶体管的第二晶体管,其中第一和第二晶体管包括电流镜拓扑。 第三晶体管与第一晶体管串联连接,运算放大器具有连接到第三晶体管的基极的输出端。 第三晶体管具有耦合到电流镜的基极结的集电极。 运算放大器具有通过第一电阻器耦合到第二晶体管的集电极的正输入端子,以及通过第二电阻器耦合到第三晶体管的发射极的负输入端子,第一和第二电阻器具有基本相似的阻抗值。