Transformerless hybrid circuit

Details Transformerless hybrid circuit Transformerless hybrid circuit

1994-07-08

1996-06-18

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379391, H04M 1900

Patent

active

055286852

ABSTRACT:
An electronic hybrid useful in telephone line-powered Data Access Arrangements. The hybrid has a transmit amplifier with an output driving the base of a bipolar transistor. The emitter of the transistor is connected to a sense resistor which is, in turn, connected to one wire of a telephone line. The collector of the transistor connects to another wire of the telephone line. A summing node couples together signals on the telephone line and signals across the sense resistor such that the remaining signal on the summing node is substantially the signal received from the telephone line without the signal to be transmitted.

REFERENCES:
patent: 4056719 (1977-11-01), Waaben
patent: 4479066 (1984-10-01), Embree
patent: 4491700 (1985-01-01), Tahara
patent: 4715064 (1987-12-01), Claessen
patent: 4807283 (1989-02-01), Pyhalammi
patent: 4989243 (1991-01-01), Choi
patent: 5029203 (1991-07-01), Ikefuji
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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