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Size: 1004
Comment:
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Size: 1005
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 23: | Line 23: |
| == frequency discriminator == | == frequency counter == |
| Line 25: | Line 25: |
| . build by ourselves | .SR620 attachment:SR620.png |
Electronics
outline
- Preliminary design for the electronics used in 40m green locking.
VCO
- build by ourselves
- need a specification
PDH box
- what kind of modification
frequency counter
- SR620
attachment:SR620.png
digital channel assign
whitening filter
- what is the specification for each channel
wideband RFPD for green PLL
- A Silicon photodiode with the diameter of 10mm is used.
To have a fast response up to about 1MHz -150V is applied onto the photo diode.
The schematic is available at https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD
digital front end
- anti-aliasing filter
- anti-imaging filter