Input amplifier for thermally viewing device with photoresistor

Details Input amplifier for thermally viewing device with photoresistor Input amplifier for thermally viewing device with photoresistor

1989-08-04

1991-08-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 250332, H01L 2500, H01J 4014

Patent

active

050380265

ABSTRACT:
A circuit arrangement for infrared detectors, more especially for thermal viewing devices with photoresistors as detector elements is designed in order so as not to necessitate an input amplifier and an output amplifier for each detector. For this purpose the collector current of a transistor is integrated for a scan period in a capacitor and at the end of the scan period the capacitor is discharged through an electronic switch to a present potential.

REFERENCES:
patent: 4173723 (1979-11-01), Temes et al.
patent: 4567363 (1986-01-01), Goodnough
patent: 4659928 (1987-04-01), Tew
patent: 4733077 (1988-03-01), Gaalema et al.
patent: 4791286 (1988-12-01), Wall
patent: 4868902 (1989-09-01), Sato

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