Transcription of Photodiode/Phototransistor Application Circuit
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Photodiode/Phototransistor Application Circuit
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. Also in this arrangement,the VOUT is given as VOUT = IP RL. An output voltageproportional to the amount of incident light is proportional region is expanded by the amount ofVCC {proportional region: VOUT < (VOC + VCC)}.
Application Note 1 Application Note Optoelectronics FUNDAMENTAL PHOTODIODE CIRCUITS Figures 1 and 2 show the fundamental photodiode circuits. The circuit shown in Figure 1 …
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