Light signal receiver with preamplification function and dual po

Details Light signal receiver with preamplification function and dual po Light signal receiver with preamplification function and dual po

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.

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