Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-07-18
1992-03-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
377102, H01J 3150
Patent
active
050935658
ABSTRACT:
An optoelectronic apparatus where information is communicated to and from the apparatus in the optical domain, but where the apparatus includes a transmission gate advantageously interposed between successive optoelectronic gates to sequentially convey information internally in the form of electrical, rather than optical, signals. Illustratively, the transmission gate is optoelectronic and comprises two back to back p-i-n photodiodes each including a quantum well region. The first and second optoelectronic gates are S-SEEDs comprising p-i-n photodiodes also each including a quantum well region. The transmission gate is responsive to a first level of the optical control signal for substantially blocking current, and to a second level of the optical control signal for substantially passing current. Applications of the apparatus include its use in a shift register, 2.times.1 switch, 1.times.2 switch, and an exclusive OR gate.
REFERENCES:
patent: Re32893 (1989-03-01), Miller
patent: 4689793 (1987-08-01), Liu et al.
patent: 4754132 (1988-06-01), Hinton et al.
patent: 4800262 (1989-01-01), Lentine
patent: 4985621 (1991-01-01), Aull et al.
AT&T Bell Laboratories
Nelms David C.
Shami Khaled
Watland Ross T.
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