Integrated circuit for detecting changes in light intensity

Details Integrated circuit for detecting changes in light intensity Integrated circuit for detecting changes in light intensity

1978-02-15

1980-04-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250211J, 307311, 340692, 340693, 356223, G08B 2100

Patent

active

041997530

ABSTRACT:
An integrated circuit employing a photo-diode activates an alarm when an intruder causes a change in the ambient light patterns by more than about 5% in an area under surveillance. The circuit includes a voltage regulator for supplying a back bias voltage to the photo-diode which voltage is substantially purged of noise that may be superimposed on the main d.c. supply voltage conductors. The regulator circuit includes a modified current-mirror type current source and a V.sub.BE -multiplier circuit providing a log-log noise transfer function.

REFERENCES:
patent: 3779142 (1973-12-01), Yata et al.
patent: 3859519 (1975-01-01), Weischedel
patent: 3863239 (1975-01-01), Campman
patent: 4085411 (1978-04-01), Genesi
Greene, A. B., Analog Integrated Circuit Design, pp. 118, 119, 122 & 123, Van Nostran Reinhold Co., New York, 1972.

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