- #1
tomizzo
- 114
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Hello,
I'm attempting to use a photodiode as a light intensity sensor. However, I have a question regarding the operation of a photodiode in a reverse biased position. The current going through the photodiode is dependent on the light received, and is not affected much by the reverse biased voltage (assuming you're applying reasonable voltages). However, wouldn't the current be dependent on the resistance that is in series with the photodiode? The datasheets I've been reading illustrate the relationship between the light received and the current produced, but there is no mentioning of any resistance. Does this mean that photodiode will act as a constant current source regardless of the resistance used in series with the photodiode?
I've attached an image of the circuit in question.
I appreciate any help!
I'm attempting to use a photodiode as a light intensity sensor. However, I have a question regarding the operation of a photodiode in a reverse biased position. The current going through the photodiode is dependent on the light received, and is not affected much by the reverse biased voltage (assuming you're applying reasonable voltages). However, wouldn't the current be dependent on the resistance that is in series with the photodiode? The datasheets I've been reading illustrate the relationship between the light received and the current produced, but there is no mentioning of any resistance. Does this mean that photodiode will act as a constant current source regardless of the resistance used in series with the photodiode?
I've attached an image of the circuit in question.
I appreciate any help!