Impedance generator circuit

Details Impedance generator circuit Impedance generator circuit

1980-06-30

1982-09-21

Gensler, Paul L.

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

307324, 307494, 333216, H03H 1146

Patent

active

043509649

ABSTRACT:
An improved impedance generator 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 generate a desired positive or negative impedance across the wires. The impedance generator includes a current source, and generates a positive impedance by drawing from the wires all of the current that would otherwise be required by the positive impedance, or a negative impedance by providing on the wires all of the current that would otherwise be provided by the negative impedance, in response to a metallic voltage applied across the wires by a signal source. At the same time, the impedance generator provides common mode rejection to longitudinal voltages on the wires.

REFERENCES:
patent: 3413576 (1968-11-01), Sheahan
patent: 3828281 (1974-08-01), Chambers, Jr.
patent: 4288707 (1981-09-01), Katakura

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