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| == outline == |
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| [[BR]] [[BR]] ----- == VCO == . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely. |
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| == VCO == . build by ourselves . need a specification |
----- [[BR]] |
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| == frequency discriminator == | [[BR]] ----- == frequency counter == |
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| . build by ourselves | .SR620 is employed to read out the frequency of the beat signal. |
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| attachment:SR620.png ||<-3> '''''setting parameters''''' || || readout range || || MHz || || DAC bit resolution || || || || noise || || || [[BR]] ----- |
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| <<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/electronics_diagram ,height=400)>> | <<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>> |
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| [[BR]] ----- |
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| [[BR]] ----- == 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 on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn] === frequency response === attachment:RFPD_tf.png === noise performance === attachment:RFPDnoise.png Here is the noise model for the RFPD using liso. attachment:liso_RFPD.png [[BR]] ----- |
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 on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]
frequency response
attachment:RFPD_tf.png
noise performance
attachment:RFPDnoise.png
Here is the noise model for the RFPD using liso. attachment:liso_RFPD.png
digital front end
- anti-aliasing filter
- anti-imaging filter