10-02-2013 03:42 AM
Hello,
I am trying to design a circuit that will convert photodiode current received from the intensity of the LED to the Voltage.Before practically implementing it on board I would like to simulate it and using NI multisim for this purpose.I used Infrared LED,TEMD1000 Photodiode and OPA380 for this design as in attached file.
My requirement is that when the intensity of LED changes the current of Photodiode should resulting in a respective Voltage out.I got the problem that even when the input to the LED is at 0V it is showing photodiode output as 458uA and OPA380 output as 4.58V. and when I am changing the input voltage of the LED also the photodetector output current is same as 458uA .The datsheet for OPA380 is given below and followed the page12 for this design.
OPA380datasheet
Can someone help me with this and I am not sure why photodidoe is not working.
Thanks in Advance.
10-02-2013 10:17 AM
Hi,
I created the attached circuit to show how the photodiode works. V1 represents light and when you run the DC sweep analysis, the voltage V1 changes to show when the diode turns on.
This photodiode doesn't sense light from a nearby LED in Mutlisim.