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Entry  Wed Mar 3 18:32:25 2010, Alberto, Update, 40m Upgrading, 11 MHz RFPD elctronics rfpd11_v2_TF.pdfrfpd11_v2_Noise.pdf
    Reply  Thu Mar 4 08:43:35 2010, Alberto, Update, 40m Upgrading, 11 MHz RFPD elctronics rfpd11_v2.fil
Message ID: 2653     Entry time: Wed Mar 3 18:32:25 2010     Reply to this: 2655
Author: Alberto 
Type: Update 
Category: 40m Upgrading 
Subject: 11 MHz RFPD elctronics 
** Please add LISO file w/ component values.
 
I designed the circuit for one of the 11 MHz photodiodes that we're going to install in the 40m Upgrade.

This is a simple representation of the schematic:

          gnd
#          |
#          Cw2
#          |
#          n23
#          |
#          Lw2
#          |
#           n22
#          |
#          Rw2                
#                 |                   |\            
#           n2- - - C2 - n3 -  - -  - |  \          
#            |    |      |   |        |4106>-- n5 - Rs -- no
# iinput    Rd   L1     L2 R24    n6- |  /     |           |
#      nin - |    |      |   |    |   |/       |         Rload    
#           Cd   n7     R22 gnd   |            |           |          
#            |    |      |        | - - - R8 - -          gnd              
#           gnd  R1     gnd      R7 
#                 |               |
#         gnd               gnd
#                 
#
#

I chose the values of the components in a realistic way, that is using part available from Coilcraft or Digikey.

Using LISO I simulated the Tranfer Function and the noise of the circuit.

I'm attaching the results.

I'll post the 55MHz rfpd later.

Attachment 1: rfpd11_v2_TF.pdf  11 kB  | Hide | Hide all
rfpd11_v2_TF.pdf
Attachment 2: rfpd11_v2_Noise.pdf  43 kB  | Hide | Hide all
rfpd11_v2_Noise.pdf
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