Two to four wire hybrid circuit

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H04B 158

Patent

active

043586430

ABSTRACT:
There is disclosed a two- to four-wire hybrid circuit of a telecommunication system. A line coupling circuit, preferably a transformer is connected to a terminal line. Between the coupling circuit and first and second amplifying means each assigned to a receiving branch and a transmitting branch of a transmission line, respectively there is arranged a balancing network composed of an attenuator, a first and a second hybrid impedance. The first impedance connected to the coupling circuit has a value matching the value of a coupled terminal line impedance which is effective at the four-wire side of the coupling circuit. The second impedance and the attenuator interconnect the outputs of the first amplifying means. The value of the series connection are chosen such that the resistance value of the attenuator is substantially higher than the value of the actual resistance component of the first impedance and the ratio of the coupled line impedance to the first line impedance equals the ratio of the attenuator resistance to the second impedance. The second input of the second amplifying means is connected to the coupling circuit.

REFERENCES:
patent: 3973089 (1976-08-01), Puckette
patent: 4163878 (1979-08-01), Hashemi
patent: 4192978 (1980-03-01), Vincent
patent: 4254305 (1981-03-01), Treiber
Appel and Abramson; "Electronic Hybrid for Telephone Using a Differential Amplifier"; IBM Tech. Disclosure Bulletin; vol. 16, No. 5; Oct. 1973; pp. 1513-1514.

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