Reply to thread

Thanks

Thanks, but all the photo diode datasheet that i have seen  do not give an AC output current....its just DC current in proportion to the light exposure.

I wonder if you are referring to Johnson noise or something?, and how this will be more, the more is the DC current?...i think i read that in an application note somewhere......you detect photodiode current by realising that the higher the dc current, the higher is the Johnson noise in the high value R's through which this tiny current flows...and so you literally measure the amplitude of the noise so as to infer the magnitude of the DC current?