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| == outline == |
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| [[BR]] [[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 | |
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----- [[BR]] |
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| === Filter Shape === | |
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| . what kind of modification | === Noise performance === |
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| == frequency discriminator == | === LPF for RF cutoff === |
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| . build by ourselves | === Low frequency mixer === |
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| === Remotely controlled Boost switch === [[BR]] ----- == frequency counter == .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 || || || [[BR]] ----- == digital channel assign == <<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>> [[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]] ----- == DC PDs == === PDA36A === attachment:PDA36A.png ||<-4> ''''' parameters ''''' || || trans impedance gain || || [V/A] || || responsibility || || [A/W]|| || quantum efficiency || || [%]|| [[BR]] ----- |
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[[BR]] ----- == Thermal compensation LPF == === circuit diagram === attachment:thermalLPF.png === expected transfer function of composed frequency actuator === attachment:thermal_actuator.png [[BR]] == Function Generator == To get a phase modulation imposed on the end IR lasers, a function generator is needed. === SR___ === [[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 |
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readout range |
|
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
- attachment:PDA36A.png
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
Thermal compensation LPF
circuit diagram
attachment:thermalLPF.png
expected transfer function of composed frequency actuator
attachment:thermal_actuator.png
Function Generator
- To get a phase modulation imposed on the end IR lasers, a function generator is needed.
SR___
Power Supply and Cables
HV cables (-150V) for photodiode bias