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| [[BR]] ----- == VCO == === Filter respons === . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely. |
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| == VCO == | === Noise performance === |
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| . build by ourselves | === lock detection and boost === . rms detection |
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| . need a specification | ----- [[BR]] == PDH box == === Filter Shape === === Noise performance == === LPF for RF cutoff === === Low frequency mixer === === Remotely controlled Boost switch === |
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| == PDH box == . what kind of modification [[BR]] |
----- |
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| .SR620 | .SR620 is employed to read out the frequency of the beat signal. |
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||<-3> '''''setting parameters''''' || || readout range || || MHz || || DAC bit resolution || || || || noise || || || |
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| ----- | |
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| ----- | |
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| ----- == 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] |
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| == 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. |
=== frequency response === attachment:RFPD_tf.png |
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| . The schematic is available at https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD | === noise performance === attachment:RFPDnoise.png Here is the noise model for the RFPD using liso. attachment:liso_RFPD.png |
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| ----- == DC PDs == === PDA36A === |
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| ||<-4> parameters || || trans impedance gain || || [V/A] || || responsibility || || [A/W]|| || quantum efficiency || || [%]|| [[BR]] ----- |
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[[BR]] ----- == Power Supply and Cables == === HV cables (-150V) for photodiode bias === === 15V and 24V lines === |
Electronics
outline
- Preliminary design for the electronics used in 40m green locking.
VCO
Filter respons
- 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
Noise performance
lock detection and boost
- rms detection
PDH box
Filter Shape
=== Noise performance ==
LPF for RF cutoff
Low frequency mixer
Remotely controlled Boost switch
frequency counter
- SR620 is employed to read out the frequency of the beat signal.
attachment:SR620.png
setting parameters |
||
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
DC PDs
PDA36A
parameters |
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trans impedance gain |
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[V/A] |
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responsibility |
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[A/W] |
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quantum efficiency |
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[%] |
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digital front end
- anti-aliasing filter
- anti-imaging filter
Power Supply and Cables
HV cables (-150V) for photodiode bias