Optically Controlled Active Impedance Element and Filters Employing the Same.
Patent, Filed 11 Dec 92, patented 20 Jul 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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.
- Electrical and Electronic Equipment
- Particle Accelerators
- Solid State Physics