Battery-feed circuit for exchange

Details Battery-feed circuit for exchange Battery-feed circuit for exchange

1989-01-11

1989-10-03

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379398, 379405, H04M 1900

Patent

active

048721999

ABSTRACT:
A compact battery-feed circuit for an exchange, including two feedback circuits provided for two wires, one being a dc feedback circuit for the dc voltage on the two wires, and the other being an ac feedback circuit for the ac voltage signal on the two wires.

REFERENCES:
patent: 4071879 (1978-01-01), Falk
patent: 4283604 (1981-08-01), Chambers, Jr.
patent: 4287393 (1981-09-01), Reuvekamp
patent: 4398143 (1983-08-01), Bonis
patent: 4456991 (1984-06-01), Chea, Jr. et al.
patent: 4476350 (1984-10-01), Aull et al.
patent: 4532381 (1985-07-01), Rosenbaum et al.
patent: 4539438 (1985-09-01), Rosenbaum et al.
patent: 4600811 (1986-07-01), Hayashi et al.
patent: 4612417 (1986-09-01), Toumani
"A High-Voltage IC for a Transformerless Trunk and Subscriber Line Interface", Aull et al., I.E.E.E. Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 261-266.
Patent Abstracts of Japan, unexamined applications, field E, vol. 8, No. 206, Sep. 20, 1984.

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