I'll take a look at that link, thanks
But problem is that when u reduce the resistance then the voltage across R1 will get small.
1) How much current can a photodiode take?...I couldn't find it in the datasheet
2) At 200 ohm the voltage amplitude is 0.1V, when I increase frequency from 0-2MHz. At 2Mhz the signal begins to have ripples, why?
One more question.
I want to calculate the current passing through the photodiode, how can that current be calculated?.....look at figure below