Battery feed circuit for a pair of subscriber lines

Details Battery feed circuit for a pair of subscriber lines Battery feed circuit for a pair of subscriber lines

1985-05-23

1987-06-30

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 1906

Patent

active

046776699

ABSTRACT:
Battery feed circuit for a pair of subscriber lines includes a voltage drive circuit with an operational amplifier having a predetermined output impedance determined by an alternating current terminal impedance for the pair of subscriber lines. Both voice signals and induced noise signals are terminated by the voltage drive circuit. The voltage drive circuit is connected in parallel with an electronic inductance circuit, between one of the subscriber lines and ground or a direct current voltage supply.

REFERENCES:
patent: 4433213 (1984-02-01), Albers et al.

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