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1.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
发明人： KLOSTERMAN CARSTEN H
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.
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