Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1991-11-06
1992-11-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
307311, G02B 2700
Patent
active
051626578
ABSTRACT:
An optical controlled attenuator circuit for controlling a microwave varie attenuator. The optical controlled attenuator circuit includes, a light source, a control connected to the light source, an optic fiber having an end coupled to the light source, a field effect transistor coupled to a second end of the optic fiber, a first inverting amplifier coupled to the field effect transistor, a second non-inverting amplifier coupled to the first amplifier means, a third non-inverting amplifier coupled to the second amplifier, a fourth inverting amplifier means also coupled to the second amplifier, and a microwave variable attenuator having first and second inputs respectively coupled to the fourth inverting amplifier and to the third non-inverting amplifier means and having an RF input and an RF output.
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Higgins Thomas P.
Paolella Arthur
Sturzebecher Dana J.
Allen S.
Anderson William H.
Nelms David C.
The United States of America as represented by the Secretary of
Zelenka Michael
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