Supply circuit for a variable load, particularly for a line circ

Details Supply circuit for a variable load, particularly for a line circ Supply circuit for a variable load, particularly for a line circ

1983-10-03

1986-12-30

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

For line length compensation

379412, H04M 176, H04M 1900

Patent

active

046330380

ABSTRACT:
The invention relates to a supply circuit for a variable load, particularly for a line circuit in telephone systems.
Conventional supply circuits, in which each of the two supply-current branches to the line wires contains the collector-emitter path of a transistor in series with an emitter resistor, offer a high AC resistance to voice-frequency voltages and longitudinal noise voltages, so that the bridging loss of the line remains small. To achieve a low AC resistance of the supply circuit to the longitudinal noise voltages, special measures in the control circuits of the transistors, particularly the use of a nonlinear element in the form of a CRD current-limiting diode in parallel with the controlled current path of each of the transistors, are proposed. These measures greatly reduce the amplitude of the longitudinal noise voltages at the inputs of subsequent circuits, which are thus protected.

REFERENCES:
patent: 3943432 (1976-03-01), Colardelle et al.
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4203009 (1980-05-01), Tattersall
patent: 4267408 (1981-05-01), Schoofs
patent: 4287392 (1981-09-01), Melindo
patent: 4321430 (1982-03-01), Ferrieu
patent: 4356354 (1982-10-01), Ferrieu
patent: 4370527 (1983-01-01), Ruff et al.
patent: 4400588 (1983-08-01), Stobbs et al.

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