Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1992-02-28
1993-03-30
Mis, David
Oscillators
With device responsive to external physical condition
Temperature or light responsive
331108R, 331115, 331181, H03B 500
Patent
active
051987830
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 used the optical controlled active impedance element, in a prescribed manner, to serve as a tuneable capacitor for use in various microwave circuits.
REFERENCES:
patent: 3818370 (1974-06-01), Abe et al.
patent: 4873497 (1989-10-01), Kielmeyer, Jr.
Herczfeld Peter R.
Jemison William D.
Bechtel James B.
Mis David
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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