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106 条记录 (耗时 0.011 秒)

    Tunnel diode amplifier
    12.
    发明授权
    Tunnel diode amplifier 失效
    隧道二极管放大器

    公开(公告)号：US3609574A

    公开(公告)日：1971-09-28

    申请号：US3609574D

    申请日：1970-05-26

    申请人： RAYTHEON CO

    发明人： GEISSLER ROBERT G

    IPC分类号： H03F3/12 ,  H03F15/00

    CPC分类号： H03F3/12

    摘要： A tunnel diode amplifier circuit including a two-stage amplifier in which one of the tunnel diode stages is located one quarter of a wavelength nearer or further away from the transmission line circulators than the other. This 1/4 wavelength difference provides a complementary effect with temperature of the two stages so that the net response is considerably less effected by changing temperature as compared with that of two identical stages in cascade.

    Shunt-type negative impedance converter with both short and open circuit stability
    13.
    发明授权
    Shunt-type negative impedance converter with both short and open circuit stability 失效
    具有双向短路和开路稳定性的分流式负阻抗转换器

    公开(公告)号：US3562561A

    公开(公告)日：1971-02-09

    申请号：US3562561D

    申请日：1969-03-21

    申请人： BELL TELEPHONE LABOR INC

    发明人： KLOSTERMAN CARSTEN H

    IPC分类号： H03K3/28 ,  H04B3/18 ,  H03K3/26 ,  H03F15/00 ,  H03J3/20

    CPC分类号： H04B3/18 ,  H03K3/28

    摘要： A shunt type negative impedance converter (NIC) which is normally only short circuit stable is also made open circuit stable by internal circuit action so that it can be used in shunt across telephone trunk circuits to cancel the resistance of central office battery feed resistors. It includes two transistors of opposite conductivity type with a resistive voltage divider and a zener diode controlling the base biasing voltage of the PNP transistor. Whenever a telephone subscriber goes on-hook, presenting a substantially open circuit to the converter, the action of the voltage divider and the zener diode causes both transistors to switch to their nonconducting states.