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Photodiode/Phototransistor Application Circuit - PhysLab

Application Note 1 Application NoteOptoelectronicsFUNDAMENTAL PHOTODIODE CIRCUITSF igures 1 and 2 show the fundamental Circuit shown in Figure 1 transforms a photo-current produced by a photodiode without bias into avoltage. The output voltage (VOUT) is given asVOUT=1P RL. It is more or less proportional to theamount of incident light when VOUT < VOC. It can alsobe compressed logarithmically relative to the amount ofincident light when VOUT is near VOC. (VOC is the open-terminal voltage of a photodiode).Figure 1 (B) shows the operating point for a load resis-tor (RL) without Application of bias to the 2 shows a Circuit in which the photodiode isreverse-biased by VCC and a photocurrent (IP) is trans-formed into an output voltage.

The circuit of Figure 4 (B) has an additional transis-tor (Tr2) to provide a larger output current. Cj = AV()D – VR 1 n – ---Figure 3. Photocurrent Amplifier Circuit using Transistor IP OP1-18 RBE VCC Tr1 RL Tr1 RBE VOUT VBE VBE L VCC VOUT IP (A) (B) Figure 4. Photocurrent Amplifier Circuit with Negative Feedback Tr1 R1 R3 VCC R2 VOUT Tr2 ...

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