|
Size: 1004
Comment:
|
Size: 1246
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 10: | Line 10: |
| [[BR]] ----- == VCO == . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely. |
|
| Line 11: | Line 15: |
| == VCO == . build by ourselves . need a specification |
----- |
| Line 23: | Line 23: |
| == frequency discriminator == | ----- == frequency counter == |
| Line 25: | Line 26: |
| . build by ourselves | .SR620 is employed to read out the frequency of the beat signal. attachment:SR620.png ||<-3> '''''setting parameters''''' || || readout range || || MHz || || DAC bit resolution || || || || noise || || || |
Electronics
outline
- Preliminary design for the electronics used in 40m green locking.
VCO
- 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
PDH box
- what kind of modification
frequency counter
- SR620 is employed to read out the frequency of the beat signal.
attachment:SR620.png
setting parameters |
||
readout range |
|
MHz |
DAC bit resolution |
|
|
noise |
|
|
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