There is no problem. It is just a matter of noise requirement.
How much shotnoise intercept current do you require?
At the 40m, the 33MHz PD has the shotnoise intercept current of 0.52mA. https://wiki-40m.ligo.caltech.edu/Electronics/RFPD/REFL33
Is that enough? How much is yours?
You should be able to realize the similar value because the technology used for your resonant PD is the same as the 40m one, I suppose.
If you require super low noise like uA (=sub pA/rtHz current noise), then we will need a high gain and low junction capacitance. |