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Entry  Thu May 6 16:18:37 2010, Alberto, Update, 40m Upgrading, New improved design for the 11MHz photodiode pox11.pdf
    Reply  Thu May 6 19:57:26 2010, Alberto, Update, 40m Upgrading, New improved design for the 11MHz photodiode pox11.pdf
       Reply  Fri May 7 11:21:49 2010, koji, Update, 40m Upgrading, New improved design for the 11MHz photodiode 
          Reply  Fri May 7 18:18:02 2010, Alberto, Update, 40m Upgrading, New improved design for the 11MHz photodiode 
             Reply  Fri May 7 19:02:27 2010, rana, Update, 40m Upgrading, New improved design for the 11MHz photodiode 
Message ID: 2893     Entry time: Thu May 6 19:57:26 2010     In reply to: 2886     Reply to this: 2894
Author: Alberto 
Type: Update 
Category: 40m Upgrading 
Subject: New improved design for the 11MHz photodiode 

Quote:

After munching analytical models, simulations, measurements of photodiodes I think I got a better grasp of what we want from them, and how to get it. For instance I now know that we need a transimpedance of about 5000 V/A if we want them to be shot noise limited for ~mW of light power.

Adding 2-omega and f1/f2 notch filters complicates the issue, forcing to make trade-offs in the choice of the components (i.e., the Q of the notches)

Here's a better improved design of the 11Mhz PD.

 This should be better. It should also have larger resonance width.

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