Circuit arrangement for receiving unipolar DC signals

Details Circuit arrangement for receiving unipolar DC signals Circuit arrangement for receiving unipolar DC signals

1980-07-11

1981-09-29

Robinson, Thomas A.

Telegraphy

Systems

Automatic

179 84A, H04M 126

Patent

active

042924669

ABSTRACT:
There is disclosed a circuit arrangement for receiving unipolar DC signals from a transmission line of a telecommunication system. An opto-coupler circuit is coupled with a light-emitting element at the input side to two wires of the receiving branch of the transmission line. A current reflector circuit arranged at the input side of the opto-coupler circuit is composed of a pair of transistors with a common base connection coupled to one wire of the transmission line. One of these transistors is connected in series by its collector-emitter path with the light-emitting element. The second transistor is symmetrically arranged between both wires of the transmission line. A resistor is arranged in the emitter circuit of one transistor for controlling the current reflection ratio.

REFERENCES:
patent: 3867567 (1975-02-01), Herron et al.
patent: 4142075 (1979-02-01), Olschewski

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