Device for the transmission of push-pull signals across a two-wi

Details Device for the transmission of push-pull signals across a two-wi Device for the transmission of push-pull signals across a two-wi

1977-06-24

1978-09-05

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 59, H04L 514

Patent

active

041122534

ABSTRACT:
A device for the transmission of push-pull signals by way of a two-wire line in full duplex operation has a push-pull transmitter for the transmission of the push-pull signals to an opposite station and a push-pull receiver for the simultaneous reception of the push-pull signals transmitted from the opposite station, and a compensation circuit for compensating the push-pull signals transmitted from the associated push-pull transmitter in relation to the inputs of the push-pull receiver. The push-pull transmitter and the push-pull receiver are designed as symmetrical differential amplifiers composed of emitter-coupled transistors and are provided with a constant current feed. The compensation circuit is of symmetrical construction and inputs of the push-pull receiver are connected to the wires of the two-wire line by way of two identical decoupling resistors which form parts of the compensation circuit.

REFERENCES:
patent: 2133832 (1938-10-01), Pullis
patent: 3725582 (1973-04-01), Davis
patent: 3758719 (1973-09-01), Klose
patent: 3927257 (1975-12-01), Copenhafer
patent: 3983324 (1976-09-01), Lacher

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