Automatic impedance matching

Details Automatic impedance matching Automatic impedance matching

1990-02-16

1991-10-15

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324642, 324647, 324533, 333 32, G01R 2700, H03H 740

Patent

active

050577832

ABSTRACT:
Apparatus (1) for performing an electrical test on a cable (3) used in local area networks (LAN's). A source (37) produces electrical signals transmitted through the cable. A resistance circuit (43) is interposed between the source and the cable. The amount of resistance interposed by the resistance circuit is adjusted using an adjustment circuit (67). A sensor (71) senses a characteristic of the signal and determines when that characteristic has a value representing an inpedance match between the source and the cable. The sensor circuit provides a command to the adjustment circuit to thereafter maintain the point of adjustment at which the impedances are matched.

REFERENCES:
patent: 3710240 (1973-01-01), Kuehnemann et al.
patent: 4484131 (1984-11-01), Jenkinson
patent: 4853950 (1989-08-01), Crane
patent: 4967159 (1990-10-01), Manes
patent: 4970466 (1990-11-01), Bolles et al.

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