[Ronja] high speed measuring with photodiode

[Karel Kulhavy]

---- "Gyurkó Martin" <asteri_x at freemail.hu> schrieb:
> hi folks!
> 
> how do i measure high speed ramp up with photodiode?
> 
> Is it enough to just bias the PD with voltage, and use a 50 Ohm load 
> resistor?
> Are there any other usages that make PD-s faster?

Give the diode the maximum rated voltage. That will decrease the capacitance. But
with 1.3pF (SFH203 @48V) and 50 Ohm you have 2.5GHz, but the diode has internal speed
only 200 MHz according to the datasheet. You cannot make the carriers move faster
inside. How fast do you need it and for what purpose?

Karel