Telephonic communications – Line equalization or impedance matching
Patent
1987-11-04
1990-07-17
Ng, Jin F.
Telephonic communications
Line equalization or impedance matching
379344, 379346, 333215, 333 24R, H04B 304
Patent
active
049426036
ABSTRACT:
A reciprocal impedance conversion network is disclosed. Such conversion network preferably is used in a reciprocal negative impedance repeater for the nonloaded cable facilities of a telephone system. Two independent voltage sources for generating reciprocal negative impedance are connected between a first port and a second port. The first port is operably connected to the first voltage source such that a series negative impedance appears at that port. This port is specifically connected to the switching equipment of the telephone system. The second port is operably connected to the second voltage source such that a shunt negative impedance appears at that port. The second port is specifically connected to the nonloaded cable facilities of the telephone system. The invention further provides a frequency dependent gain circuit which is useful for equalizing the losses along the nonloaded cable facilities. In addition, the invention provides an unconditional stability test for the reciprocal negative impedance repeater which may be performed substantially without test equipment.
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Ng Jin F.
Vaas Randall S.
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