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| === frequency response === attachment:RFPD_tf.png |
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 |
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readout range |
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MHz |
DAC bit resolution |
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noise |
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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
frequency response
attachment:RFPD_tf.png
noise performance
attachment:RFPDnoise.png
digital front end
- anti-aliasing filter
- anti-imaging filter