Line circuit with flux compensation and active impedance termina

Details Line circuit with flux compensation and active impedance termina Line circuit with flux compensation and active impedance termina

1983-01-17

1985-03-05

Brown, Thomas W.

Electricity: power supply or regulation systems

Remote sensing

179 18FA, 179170D, 323356, H04B 158, H04F 1902, H04F 2742

Patent

active

045032890

ABSTRACT:
A telephone line circuit comprises a transformer that has a primary (13) and a secondary (14) winding. A low resistance (15) is connected in series with the primary winding. An amplifier circuit (17) is coupled across the resistance and serves to develop a predetermined dc control voltage. This control voltage is used to establish a dc current flow in the secondary which is n times that of any dc current flow in the primary, where n is the transformer turns ratio. The dc current flow established in the secondary is in a direction opposite that of the dc current flow in the primary. A second amplifier circuit (31, 36, 23) is coupled across the primary winding and serves to generate an ac control signal which is also delivered to the secondary winding to create a predetermined ac termination impedance.

REFERENCES:
patent: 4096363 (1978-06-01), Earp
patent: 4182936 (1980-01-01), Beirne et al.
patent: 4241239 (1980-12-01), Pernyeszi
patent: 4243842 (1981-01-01), Gibb
patent: 4319093 (1982-03-01), Bars
patent: 4321431 (1982-03-01), Beirne et al.
patent: 4387273 (1983-06-01), Chea, Jr.
"A High-Voltage IC for a Transformerless Trunk and Subscriber Line Interface" by D. W. Aull et al., IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug. 1981, pp. 261-266.

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