Light measuring circuit with stray capacitance compensating mean

Details Light measuring circuit with stray capacitance compensating mean Light measuring circuit with stray capacitance compensating mean

1975-12-24

1978-02-28

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 307246, 354 60R, H01J 3912, G01J 132

Patent

active

040769771

ABSTRACT:
The present invention relates to a light measuring circuit consisting of an operational amplifier, a feed back path connected with said operational amplifier, a photo voltaic cell and a switching circuit for bringing the input terminals of said operational amplifier to the same potential at the time light measurement is commenced. By means of this switching circuit connected to the light measuring circuit the delayed response of the light measuring circuit due to the stray capacitence existing between the input terminal of the operational amplifier and ground is remarkably improved.

REFERENCES:
patent: 3523189 (1970-08-01), Hansen et al.
patent: 3655987 (1972-04-01), Hinds
patent: 3743837 (1973-07-01), Pooley et al.
patent: 3813539 (1974-05-01), Sioma
patent: 3835313 (1974-09-01), Stiefelmeyer et al.
patent: 3872329 (1975-03-01), Dodson

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