Accession Number : ADD015863

Title :   Optically Controlled Active Impedance Element and Filters Employing the Same.

Descriptive Note : Patent, Filed 11 Dec 92, patented 20 Jul 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Jemison, William D ; Herczfeld, Peter R

Report Date : 20 Jul 1993

Pagination or Media Count : 11

Abstract : An optically controlled active impedance element particularly suited to serve 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.

Descriptors :   *INTEGRATED CIRCUITS, *PATENTS, CAPACITORS, ILLUMINATION, IMPEDANCE, INDUCTANCE, MICROWAVE OSCILLATORS, MICROWAVES, OSCILLATORS, SEMICONDUCTORS, METALS, FIELD EFFECT TRANSISTORS

Subject Categories : Electrical and Electronic Equipment
      Particle Accelerators
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE