Optically controlled active impedance element and filters employ

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307311, 333174, 333214, H03H 1112, H03H 1148

Patent

active

052296652

ABSTRACT:
An optically controlled active impedance element particularly suited to se as a tuneable inductive element for a microwave oscillator is disclosed. The optically controlled active inductive element is comprised of a circuit arrangement, preferably consisting of MESFET devices which exhibit a composite inductive characteristics, and whose inductance may be determined and controlled by direct illumination impinging on the MESFETs. The optically controlled active inductive element lends itself to being adapted to monolithic microwave integrated circuit (MMIC) applications and may find use in a wide variety of microwave circuits. Also disclosed, is an embodiment which uses the optical controlled active impedance element, in a prescribed manner, to serve as a tuneable capacitor for use in various microwave circuits.

REFERENCES:
patent: 4873497 (1989-10-01), Kielmeyer, Jr.
patent: 5097145 (1992-03-01), Hayashi

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