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    • 58. 发明授权
    • Variable impedance circuits
    • 可变阻抗电路
    • US4179650A
    • 1979-12-18
    • US864266
    • 1977-12-27
    • Isao FukushimaAkihiro AsadaKazuya Takahashi
    • Isao FukushimaAkihiro AsadaKazuya Takahashi
    • H01L29/66H03G1/00H03H11/24H03H11/46G05F1/48
    • H03H11/46H03G1/0035H03G1/0082H03H11/24
    • A variable impedance circuit comprises a differential current circuit having a diode and a first transistor connected so as to operate differentially with respect to each other, and a current control circuit for controlling current flowing through the differential current circuit, whereby variation of the operative resistance of the differential current circuit causes variation of impedance thereof. The current control circuit comprises a second transistor having a collector connected with the differential connection of the differential current circuit, and an emitter grounded via a resistor, and a third transistor having a base applied with a control voltage and an emitter connected with the emitter of the second transistor. A fourth transistor is also provided having a collector connected to the base of the second transistor, a base connected to the collector of the third transistor and an emitter applied with source voltage independently from the current flowing through the differential current circuit. The current control circuit is connected with the differential current circuit through only the collector of the second transistor to establish a high impedance of the current control circuit as seen by the differential current circuit.
    • 可变阻抗电路包括具有二极管和第一晶体管的差分电流电路,所述第二晶体管被连接成相对于彼此差分地工作;以及电流控制电路,用于控制流过差分电流电路的电流,由此, 差分电流电路导致其阻抗的变化。 电流控制电路包括第二晶体管,其具有与差分电流电路的差分连接的集电极,以及通过电阻器接地的发射极,以及具有施加有控制电压的基极和与发射极连接的发射极的第三晶体管 第二晶体管。 还提供第四晶体管,其具有连接到第二晶体管的基极的集电极,连接到第三晶体管的集电极的基极和独立于流过差分电流电路的电流施加源电压的发射极。 电流控制电路仅通过第二晶体管的集电极与差分电流电路连接,以建立电流控制电路的高阻抗,如差分电流电路所示。