Hybrid circuit

Details Hybrid circuit Hybrid circuit

H - Electricity

03

H

333/12

H03H 11/36 (2006.01) H04B 1/58 (2006.01)

Patent

CA 1155937

1 PHN.9456 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 differ- ential amplifier whose output is connected via a winding (W1) of a transformer to an impedance. The inverting input of amplifier is connected via a winding (W2) to the junction of winding (W1) and impedance. The trans- mit port is connected via a winding W3 to the junction of winding (W1) and impedance. The two wire port is connected to a winding (W4) on the transformer. Signals applied to the receive port are coupled to the two-wire port but produce voltages across the impedance and wind- ing (W3) which cancel to the transmit port whereas sig- nals applied to the two-wire port are transferred to the transmit port. The use of the amplifier enables a smaller transformer to be used.

351109

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