Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-08-29
1991-05-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
330278, H01J 4014, H03G 310
Patent
active
050158392
ABSTRACT:
An apparatus and method for controlling gain automatically uses a light receiving element, a gain amplifier, a difference amplifier, a controller and a variable level circuit. The light receiving element generates electrical signals corresponding to received optical signals. The gain amplifier amplifies the electrial signals and the difference amplifier generates signals corresponding to the difference between defined level of amplified signal and predetermined level. In response to output signals from the difference amplifier, the controller generates signals for controlling gain of the gain amplifier and multiplication factor of the receiving element. The level circuit supplies signals to the receiving element in response to output signals from the controller.
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Kabushiki Kaisha Toshiba
Messinger Michael
Nelms David C.
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