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| = Electronics = == outline == |
= Overview of green electronics = |
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| <<TableOfContents(2)>> |
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| == VCO == === Filter respons === |
= VCO for frequency tracking = == VCO range == . Synergy VCO part number XXX has 1.2MHz/V VCO range. attachment:VCO_range.png == Filter respons == |
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| === Noise performance === | attachment:VCO_filter.png |
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| === lock detection and boost === | == Noise performance == == Capture range and Lock range == . According to a simple calculations... == lock detection and boost == |
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| == PDH box == === Filter Shape === |
= PDH box = == Filter Shape == attachment:TF_PDH.png |
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| === Noise performance == | == Noise performance == |
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| === LPF for RF cutoff === | == LPF for RF cutoff == |
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| === Low frequency mixer === | |
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| === Remotely controlled Boost switch === | == Remotely controlled Boost switch == |
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| == frequency counter == | = frequency counter = |
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| == digital channel assign == | = digital channel assign = |
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| == whitening filter == . what is the specification for each channel [[BR]] ----- == wideband RFPD for green PLL == |
= wideband RFPD for green PLL = |
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| === frequency response === | == frequency response == |
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| === noise performance === | == noise performance == |
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| == DC PDs == === PDA36A === |
= DC PDs = == PDA36A == |
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| ||<-4> parameters || | ||<-4> ''''' parameters ''''' || |
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| || output impedance || 50 || [Ohm] || | |
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| == digital front end == | = digital front end filters = |
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| . whitening filter |
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| == Power Supply and Cables == === HV cables (-150V) for photodiode bias === === 15V and 24V lines === |
= 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 . attachment:tc200.jpg [[BR]] ----- = RF stuff = == low noise amplifier == == mid power amplifier == == power splitter == . ''' ZFRSC-42 ''' from mini circuit. DC-4.2GHz . attachment:k18.jpg == DC block == . ''' BLK-89''' from mini circuit. 50 Ohm, 100kHz-8GHz . attachment:ff888.jpg == Low frequency mixer == . ''' ZAD-8''' from mini circuit. 500Hz-10MHz. . attachment:m22.jpg [[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 |
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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
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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output impedance |
50 |
[Ohm] |
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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
- attachment:tc200.jpg
RF stuff
low noise amplifier
mid power amplifier
power splitter
ZFRSC-42 from mini circuit. DC-4.2GHz
- attachment:k18.jpg
DC block
BLK-89 from mini circuit. 50 Ohm, 100kHz-8GHz
- attachment:ff888.jpg
Low frequency mixer
ZAD-8 from mini circuit. 500Hz-10MHz.
- attachment:m22.jpg
Power Supply and Cables
HV cables (-150V) for photodiode bias