Telephone line battery feed circuit

Details Telephone line battery feed circuit Telephone line battery feed circuit

1975-11-12

1977-02-08

Claffy, Kathleen H.

179 18FA, H04M 176

Patent

active

040073351

ABSTRACT:
A telephone line battery feed circuit for supplying talking current to a subscriber subset and at the same time reducing common mode interference signals. The inputs of a differential operational amplifier are coupled to a telephone line and the outputs of the differential operational amplifier are coupled to a battery feed circuit. The battery feed circuit provides talking current to the subscriber subset and the differential operational amplifier presents a high impedance between the battery and the telephone line to differential voice signals while at the same time presenting a low impedance between the telephone line and the battery for common mode interference signals thereby reducing the latter.

REFERENCES:
patent: 3035122 (1962-05-01), Livingstone
patent: 3594510 (1971-07-01), Blashfield
patent: 3748395 (1973-07-01), Herter
patent: 3808377 (1974-04-01), Young
patent: 3916110 (1975-10-01), Lee et al.

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