Impedance canceller circuit

Details Impedance canceller circuit Impedance canceller circuit

1980-06-30

1982-11-02

Tupper, Robert S.

179 70, 179 77, H04B 316, H04B 328

Patent

active

043574947

ABSTRACT:
An improved impedance canceller circuit, for use with two-wire transmission systems of the type encountered in telephony, is adapted to be interfaced with the wires and operates in a manner to effectively eliminate or cancel an unwanted impedance across the wires. The impedance canceller includes a current source, and essentially supplies on the wires all of the current that would otherwise be required by the unwanted impedance in response to a metallic voltage applied across the wires by a signal source, so that the signal source does not supply such current and the unwanted impedance appears as an open circuit to the metallic voltage. At the same time, the impedance canceller provides common mode rejection to longitudinal voltages on the wires.

REFERENCES:
patent: 3562561 (1971-02-01), Klosterman
patent: 3870896 (1975-03-01), Kiko
patent: 3916110 (1975-10-01), Lee et al.
patent: 3955052 (1976-05-01), Orbach
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4087647 (1978-05-01), Embree et al.
patent: 4203009 (1980-05-01), Tattersall
patent: 4272656 (1981-06-01), Nishikawa

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