Resistance forward telephone line feed circuit

Details Resistance forward telephone line feed circuit Resistance forward telephone line feed circuit

1994-08-30

1996-05-07

Hofsass, Jeffery

Telephonic communications

Line equalization or impedance matching

379413, 379402, 379378, 379405, H04M 176

Patent

active

055154336

ABSTRACT:
A line feed circuit employing a low-inductance transformer, and providing a major portion of the terminating impedance as line feed resistors connected between a telephone line and the transformer primary. A low impedance output amplifier drives a low resistance transformer secondary, thus reducing the need for large transformer inductances. By connecting the line feed resistors between the transformer and the telephone line, high voltage surges are absorbed by the resistors, and thus little is dissipated in the transformer. The transformer can be made physically small, because of the reduced inductance, reduced winding insulation, and reduced power requirements. The resistance forward type of line feed circuit lends itself well to simple implementation with flux cancellation and impedance synthesis circuits.

REFERENCES:
patent: 3627952 (1971-12-01), Person
patent: 3714548 (1973-01-01), Macrander
patent: 3781483 (1973-12-01), Deisch
patent: 3934099 (1976-01-01), Elder, Jr.
patent: 4103112 (1978-07-01), Korsky
patent: 4110636 (1978-08-01), Dijkmans
patent: 4132863 (1979-01-01), Smith
patent: 4241239 (1980-12-01), Pernyeszi
patent: 4250479 (1981-02-01), Bausch et al.
patent: 4431869 (1984-02-01), Sweet
patent: 4440979 (1984-04-01), McGibbon et al.
patent: 4484032 (1984-11-01), Rosenbaum
patent: 4503289 (1985-03-01), Spires
patent: 4607142 (1986-08-01), Martin
patent: 4682355 (1987-07-01), Bailly et al.
patent: 4803718 (1989-02-01), Neil et al.
patent: 4829567 (1989-05-01), Moisin
patent: 4864609 (1989-09-01), Moisin
patent: 4899382 (1990-02-01), Gartner
patent: 4922531 (1990-05-01), Moisin
patent: 4982426 (1991-01-01), Jakab
patent: 5109409 (1992-04-01), Bomgardner et al.
patent: 5255317 (1993-10-01), Arai et al.
patent: 5274704 (1993-12-01), Jakab
patent: 5307241 (1994-04-01), Pistilli
patent: 5333196 (1994-07-01), Jakab
patent: 5373554 (1994-12-01), Sato

Affiliated with

Also associated with

Rating

Resistance forward telephone line feed circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Resistance forward telephone line feed circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistance forward telephone line feed circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1233464