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Entry  Fri Apr 12 11:43:33 2019, anchal, Notes, FSS, Photodiode C30642 doesn't has enough bandwidth! 
    Reply  Fri Apr 12 11:55:54 2019, Koji, Notes, FSS, Photodiode C30642 doesn't has enough bandwidth! 
       Reply  Fri Apr 12 18:00:59 2019, Koji, Notes, FSS, Photodiode C30642 doesn't has enough bandwidth! 
Message ID: 2322     Entry time: Fri Apr 12 11:55:54 2019     In reply to: 2321     Reply to this: 2323
Author: Koji 
Type: Notes 
Category: FSS 
Subject: Photodiode C30642 doesn't has enough bandwidth! 

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.

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