1980-04-21
1982-08-24
Wolff, John H.
179170D, H04B 158
Patent
active
043462669
ABSTRACT:
A hybrid circuit for coupling a two wire transmission path to a receive path and a transmit path of a four-wire transmission path comprises a receive port, a transmit port, and a two-wire port. The receive port is connected to a non-inverting input of a differential amplifier whose output is connected via a winding of a transformer to an impedance. The inverting input of amplifier is connected via a winding to the junction of winding and impedance. The transmit port is connected via a winding W3 to the junction of winding and impedance. The two wire port is connected to a winding on the transformer.
Signals applied to the receive port are coupled to the two-wire port but produce voltages across the impedance and winding which cancel to the transmit port whereas signals applied to the two-wire port are transferred to the transmit port. The use of the amplifier enables a smaller transformer to be used.
REFERENCES:
patent: 3480742 (1969-11-01), Gaunt, Jr.
patent: 3751602 (1973-08-01), Breeden
patent: 3875350 (1975-04-01), Fischer
Brockmann Klaus-Dieter K.
van Harreveld Teunis A.
Briody Thomas A.
Myers Randall P.
Streeter William J.
U.S. Philips Corporation
Wolff John H.
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