Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-07-05
1996-12-03
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250551, 359189, 330285, H01J 4014
Patent
active
055810772
ABSTRACT:
The present invention provides a high impedance optical receiver circuit for use in integrated circuits. The receiver circuit consists of an optical detecting device connected to the gate of an FET device and further connected to a diode providing a load impedance. The FET device is connected to a biasing voltage through a biasing resistive element and to a conditioning stage output. The use of a diode to provide a load impedance allows for a smaller and easier to manufacture receiver circuit than would be possible using either a load resistor or a load FET. According to one aspect of the present invention, a digital integrated circuit employing SEED technology incorporates a plurality of diode-loaded receiver in an array of optical receiver circuits to reduce the footprint of the overall SEED circuit array.
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D'Asaro, L. A., Chirovsky, L. M. F., Laskowski, E. J., Pei, S. S., Woodward, T. K., Lentine, A. L., Leibenguth, R. E., Focht, M. W., Freund, J. M., Guth, G. G., Smith, L. E., "Batch Fabrication and Operation of GaAs-AlxGal-xAs Field-Effect Transistor-Self-Electrooptic Effect Device (FET-SEED) Smart Pixel Arrays," IEEE Journal of Quantum Electronics, vol. 29, No. 2, Feb. 1993, pp. 670-677.
Woodward, T. K., Lentine, A. L., Chirovsky, L. M. F., Focht, M. W., Freund, J. M., Guth, G. D., Leibenguth, R. E., Smith, L. E., D'Asaro, L. A., Laskowski, Pei, S. S., "GaAs/AlGaAs FET-SEED Receiver/Transmitters," OSA Procedings on Photonics in Switching, vol. 16 Jan. 1993, pp. 89-93.
Woodward, T. K., Lentine, A. L., Chirovsky, L. M. F., Pei, S. S., Freund, J. M., D'Asaro, L. A., Focht, M. W., Loaskowski, E. J., Guth, G. D., Smith, L. E., "Operating Characteristics of GaAs/AlGaAs FET-SEED Smart Pixels," IEEE, Apr. 1992, 4 pages.
Chirovsky Leo M.
Novotny Robert A.
Woodward Ted K.
Le Que T.
Lucent Technologies - Inc.
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