Optically controlled active impedance element and filters employing the same
US5229665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Dec 11, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/24
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.