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| == outline == . Preliminary design for the electronics used in 40m green locking. <<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>> [[BR]] [[BR]] ----- == VCO for frequency tracking == === VCO range === . Synergy VCO part number XXX has 1.2MHz/V VCO range. attachment:VCO_range.png === 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 ----- [[BR]] == PDH box == === Filter Shape === === Noise performance === === LPF for RF cutoff === === Low frequency mixer === === 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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| == digital front end== | . what is the specification for each channel [[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]] ----- == digital front end == . anti-aliasing filter . anti-imaging filter [[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 for frequency tracking
VCO range
- Synergy VCO part number XXX has 1.2MHz/V VCO range.
attachment:VCO_range.png
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 |
|
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 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 |
|||
trans impedance gain |
|
[V/A] |
|
responsibility |
|
[A/W] |
|
quantum efficiency |
|
[%] |
|
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