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| = Electronics = attachment:electronics_diagram.png |
= Overview of green electronics = . Preliminary design for the electronics used in 40m green locking. <<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>> <<TableOfContents(2)>> [[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. attachment:VCO_filter.png == Noise performance == == Capture range and Lock range == . According to a simple calculations... == lock detection and boost == . rms detection ----- [[BR]] = PDH box = == Filter Shape == attachment:TF_PDH.png == Noise performance == == LPF for RF cutoff == == 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]] ----- = 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 filters= . anti-aliasing filter . anti-imaging filter . whitening filter [[BR]] ----- = Thermal feedback LPF = == circuit diagram == attachment:thermalLPF.png == expected transfer function of compound 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]] = Summing Amplifier = In order to send a feedback signal and modulation signal to the laser PZT at the same time, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. Currently this is taken place by SR560. == Diagram == == noise performance == [[BR]] ----- = Temperature Controller for doubling oves = . TC200 from Thorlabs [[BR]] ----- = RF stuff = == low noise amplifier == == mid power amplifier == == power splitter == == DC block == == Low frequency mixer == . ZAD-8 from mini circuit [[BR]] ----- = Power Supply and Cables = == HV cables (-150V) for photodiode bias == == 15V and 24V lines == |
Overview of green electronics
- Preliminary design for the electronics used in 40m green locking.
Contents
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.
attachment:VCO_filter.png
Noise performance
Capture range and Lock range
- According to a simple calculations...
lock detection and boost
- rms detection
PDH box
Filter Shape
attachment:TF_PDH.png
Noise performance
LPF for RF cutoff
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
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 filters=
- anti-aliasing filter
- anti-imaging filter
- whitening filter
Thermal feedback LPF
circuit diagram
attachment:thermalLPF.png
expected transfer function of compound 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___
Summing Amplifier
In order to send a feedback signal and modulation signal to the laser PZT at the same time, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. Currently this is taken place by SR560.
Diagram
noise performance
Temperature Controller for doubling oves
. TC200 from Thorlabs
RF stuff
low noise amplifier
mid power amplifier
power splitter
DC block
Low frequency mixer
- ZAD-8 from mini circuit
Power Supply and Cables
HV cables (-150V) for photodiode bias