Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-09-22
1995-07-25
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214RC, H01J 4014
Patent
active
054364426
ABSTRACT:
An optical detection system includes an array of photodetectors, each of which is positioned for receiving light and converting the light into an electrical signal. A plurality of high pass filters is positioned with each one of the high pass filters electrically coupled to a respective photodetector for passing a portion of a respective electrical signal having frequency components at least as high as the high pass filter cutoff frequency. In one embodiment, each one of the filters comprises a capacitance coupled to the photodetector and a depletion mode FET with shorted gate-to-source terminals coupled between the photodetector and a bias voltage source. Each of the FETs comprises a silicon substrate, a silicon dioxide first insulative layer having a trench and a first conductive layer covering a portion of the first insulative layer including a portion of the trench, and each of the capacitances comprises the first conductive layer, a second insulative layer covering a portion of the first conductive layer, and a second conductive layer covering a portion of the second insulative layer.
REFERENCES:
patent: 4511804 (1985-04-01), Ozawa
patent: 4807038 (1989-02-01), Michon
patent: 5357337 (1994-10-01), Michon et al.
patent: 5373295 (1994-12-01), Michon
Michon Gerald J.
Tiemann Jerome J.
Tomlinson, Jr. Harold W.
Allen Stephone B.
General Electric Company
Kratz Ann M.
Snyder Marvin
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