Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-01-18
1991-09-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
377102, H01J 3150
Patent
active
050456806
ABSTRACT:
A pulse converter includes a set-reset flip/flop, or OPTOGLE 10, having a pair of cross-coupled switching devices such as transistors Q1, Q2 or logic gates G1, G2. The circuit operates by coupling pulses of optical radiation to each of the devices for causing the devices to alternately toggle between an on-state and an off-state. Optical inputting devices such as photodiodes or photoconductors, or the gates of FET transistors themselves, are integrally formed upon a common substrate with the switching devices for minimizing stray inductive and capacitive reactances to substantially eliminate temporal jitter in an electrical output signal. A pulsed laser source and a fiber optic or optical waveguide provide non-overlapping optical pulses to each of the switching devices. In accordance with one embodiment each of the switching devices is a GaAs MESFET device having a gate terminal comprised of a substantially transparent layer of electrical conductor having an interdigitated geometry and an overlying anti-reflection (AR) coating.
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Fan Bunsen
Rand Ricky A.
International Business Machines - Corporation
Nelms David C.
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