Electronic battery feed circuit for telephone systems

Details Electronic battery feed circuit for telephone systems Electronic battery feed circuit for telephone systems

1984-07-27

1986-09-16

Dwyer, James L.

179170NC, H04M 1908

Patent

active

046124179

ABSTRACT:
Resistive circuits are provided at the input of an electronic battery feed circuit feedback path for lowering the voltage level of feedback signals to a metallic signal feedback portion and a common mode signal feedback portion so a common mode amplifier can be implemented in a much lower voltage technology than line amplifiers of the battery feed circuit. Additional resistive circuits at the feedback output apply metallic signals to complementary inputs of the tip and ring line amplifiers without requiring a phase splitting amplifier. In addition, signals derived from the feedback circuit are used to vary the supply voltage for the line feed circuit elements as a function of feedback signal level and to provide a common mode reference signal which causes the tip and ring amplifiers to be biased symmetrically with respect to ground and the variable negative supply.

REFERENCES:
patent: 4203009 (1980-05-01), Tattersall
patent: 4292478 (1981-09-01), Davis et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4315207 (1982-02-01), Apfel
patent: 4388500 (1983-06-01), Regan
patent: 4419542 (1983-12-01), Embree et al.
patent: 4431868 (1984-02-01), Bolus et al.
patent: 4445006 (1984-04-01), Scholich
patent: 4472608 (1984-09-01), Beirne
patent: 4476350 (1984-10-01), Aull et al.
patent: 4514595 (1985-04-01), Rosenbaum et al.
"A High-Voltage IC for a Transformerless Trunk and Subscriber Line Interface", IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 261-266, by D. W. Aull et al.

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