Battery feed circuit for subscriber line

Details Battery feed circuit for subscriber line Battery feed circuit for subscriber line

1985-05-21

1986-12-23

Dwyer, James L.

Communications: electrical

Systems

With specific power supply

379324, 379413, H04M 1900

Patent

active

046313664

ABSTRACT:
A battery feed circuit for a subscriber line includes first and second feed circuit parts, each supplying a constant current to a corresponding subscriber line. The first and second feed circuit parts are provided with at least one of a common mode noise suppressor and a power source noise suppressor. The common mode noise suppressor includes first and second reference voltage output circuits and an intermediate voltage output circuit to produce the voltage between the first and second subscriber lines and superpose the same onto the first and second reference voltages. The power source noise suppressor functions to cancel the power source noise voltage at the output, of the first and second feed circuit parts.

REFERENCES:
patent: 4525602 (1985-06-01), Robra et al.
patent: 4567331 (1986-01-01), Martin

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