Photodiode circuit using a low noise artificial load resistor

Details Photodiode circuit using a low noise artificial load resistor Photodiode circuit using a low noise artificial load resistor

1980-08-21

1982-10-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

043529828

ABSTRACT:
An improved photodector which in utilizing a low noise load network instead of a resistor has the advantages in signal-to-noise ratio of a large load resistance without the deleterious effect on response time. The circuit includes a conventional photodiode with an operational amplifier at its output. The load network is disposed in the feedback path of the operational amplifier. It consists of a second operational amplifier, a fixed resistor and a variable resistor.

REFERENCES:
patent: 3333106 (1967-07-01), Fischer
patent: 3604941 (1971-09-01), Crum
patent: 3790288 (1974-02-01), Hostetter

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