Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-11-30
1994-04-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
330 59, 359189, H01J 4014
Patent
active
053047931
ABSTRACT:
A light signal receiver in which an input of a preamplifier receives a so-called useful electric current output by a light-sensitive device. The preamplifier comprises an input stage having an input transistor assembled with a "common base" whose emitter is connected to the input of the preamplifier and whose base is kept at a fixed potential. A low input impedance and therefore a reduction of the influence of stray capacitance exhibited by the light-sensitive device results from this arrangement Further, a second input transistor can be utilized so that the preamplifier operates as a differential type preamplifier.
REFERENCES:
patent: 4139767 (1979-02-01), Witkowicz
patent: 4750217 (1988-06-01), Smith et al.
patent: 5113151 (1992-05-01), Yamamoto et al.
Patent Abstracts of Japan vol. 14, No. 213 (E-923) May 7, 1990 & JP-A-2 050 534 (Fukushima Shiyouya) Feb. 20, 1990.
Patent Abstracts of Japan vol. 11, No. 32 (P-541) Jan. 30, 1987 & JP-A-61 202 124 (Canon) Sep. 6, 1986.
Le Que T.
Nelms David C.
Thomson Composants Militaires et Spatiaux
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