Transformerless hybrid circuit having direct powered line-side a

Details Transformerless hybrid circuit having direct powered line-side a Transformerless hybrid circuit having direct powered line-side a

1994-07-08

1996-06-18

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379391, H04M 1900

Patent

active

055286860

ABSTRACT:
A telephone line-powered Data Access Arrangement having amplifiers therein directly powered from the telephone line without voltage regulators or filters. The amplifiers, such as the amplifier driving an LED in an optical isolator, draw a constant power supply current independent of the signal being amplified. Thus, amplified signals are not coupled back onto the telephone line.

REFERENCES:
patent: 4056719 (1977-11-01), Waaben
patent: 4331842 (1982-05-01), Kiko
patent: 4479066 (1984-10-01), Embree
patent: 4514595 (1985-04-01), Rosenbaum
patent: 4757528 (1986-09-01), Falater et al.
patent: 5245654 (1993-09-01), Wilkison
patent: 5280526 (1994-01-01), Laturell
AT&T Microelectronics Interface Circuit for Optically Coupled Data Access Arrangements.

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