Title: Electronic feeding bridge

Abstract: An electronic feeding bridge for a telephone line uses a two-stage circuit to provide high a.c. impedance between the load and the line and between the line and the load. The first stage includes one NPN type transistor and one PNP type transistor with their bases coupled together by a capacitor. The second stage includes one PNP type transistor and one NPN type transistor with their bases coupled together by a capacitor. The emitters of the transistors of the first stage are connected to the emitters of the transistors of the second through of a pair of resistors. The collectors of the second stage are connected to the load through of a pair of diodes, and the collectors of the transistors of the first stage are connected directly to the line.

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Inventors: Colardelle, Joel Serge (Creteil, FR)
Comte, Marie-Helene (Jouy-en-Josas, FR)
Regnier, Marc Andre (Aulnay-sous-Bois, FR)

Application Number: 505300
Filing Date: 1974-09-12
Publication_date: 1976-03-09
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 323/311 379/405
Other Classes:
US Patent Ref:

3097307	Jul, 1963	Bonn	307/255.
3209205	Sep, 1965	Olson	323/22.
3337748	Aug, 1967	Rusch et al.	307/313.
3340404	Sep, 1967	Willems et al.	307/313.
3649769	Mar, 1972	Pest	307/255.

Other Refs:
Primary Examiner: Pellinen, A. D.
Assistant Examiner:
Attorney: O'Halloran; John T., Lombardi, Jr.; Menotti J., Menelly; R. A.