Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-09-30
1993-05-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250551, 250214R, H01J 4014
Patent
active
052142752
ABSTRACT:
Disclosed is an optically activated microwave switch (10) which includes a field-effect transistor (12) that is switched between conducting and nonconducting states by a photodiode (14) that is connected between the field-effect transistor gate and drain electrode and a photodiode (16) that is connected between the field-effect transistor gate and source electrode. The circuit is configured and arranged for switching unbiased sinusoidal microwave signals of a frequency as high as approximately 10 gigahertz. A cascade arrangement of switches (10) provides increased signal handling capability in situations in which a single switch cannot be employed. Monolithic integrated circuit realizations of both single stage and cascaded stage arrangements are disclosed in which the semiconductor substrate is GaAs, the field-effect transistors are metal-semiconductor field-effect transistors and the photodiodes are interdigitated metal-semiconductor-metal devices.
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Sugeta et al., Metal-Semiconductor-Metal Photodetector for High-Speed Optoelectronic Circuits, Proceedings of the 11th Conference (1979 International) on Solid State Devices, Tokyo, 1979; Japanese Journal of Applied Physics, vol. 19, Supp. 19-1, pp. 459-464 (1980).
Frequency and Pulse Response of a Novel High Speed Interdigital Surface Photoconductor (IDPC), IEEE Electron Device Letters, vol. Edl-2, No. 5, pp. 112-114 (May 1981).
Freeman James L.
Ray Sankar
Nelms David C.
Shami K.
The Boeing Company
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