Composition of F033 the photosensitive signal amplifying circuit diagram

Published:2011/8/22 22:13:00 Author:Rebekka | Keyword: Photosensitive Signal | From:SeekIC

Sensitive signal amplification circuitis used toamplify photodiode or phototransistor optoelectronic devices such as electrical signals. When the incident light illumination changes, the optical devicecan generate certain current, because the signal is very weak sensitive, so it’s better to use a operational amplifier in very low input bias current. In order to eliminate oscillations, it adds a small capacitor C (pF orders of magnitude) in the feedback circuit, but the value of C affects the bandwidth of the amplifier. The DC gain of the circuit is l00, 1000,10000, you can select switch corresponding to 10kΩ, 1kΩ, 100Ω resistors to ground, the circuit of the resistor accuracy must be better than ± 1%. Photocell uses FPT102 or FPT100.



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