Supply circuit for a telecommunication line, providing highly sy

Details Supply circuit for a telecommunication line, providing highly sy Supply circuit for a telecommunication line, providing highly sy

1992-05-29

1994-10-25

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

For line length compensation

379400, 379412, 379413, 379324, 379398, 379399, H04M 100

Patent

active

053596552

ABSTRACT:
A supply circuit for a two-wire telecommunication line includes a voltage adjusting circuit section coupled between one of the wires and a first reference potential point and further includes a current source coupled between the second wire and a second reference potential point. A transistor in the voltage adjusting circuit section has a first main electrode coupled to the first wire, a second main electrode coupled to the first reference potential point, and a control electrode which is coupled to the first wire by way of a capacitor. In order for the supply circuit to meet strict requirements as to symmetry and demodulation, the control electrode is also coupled to the first reference potential point by way of a threshold voltage diode, which may be a zener diode. A voltage control circuit coupled to the threshold voltage diode forms a feedback loop for maintaining the line voltage at a selected value despite the presence of disturbing signals on the line.

REFERENCES:
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4716358 (1987-12-01), Fucito
patent: 4723280 (1988-02-01), Meier
patent: 4764956 (1988-08-01), Rosch et al.
patent: 5050210 (1991-09-01), Dillon et al.

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