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[[BR]] ----- = RS232 serial device server = . here are the candidates . ''' 5100A ''' from Moxa. . ''' SeaLink ''' from SeaLevel |
Overview of green electronics
- Preliminary design for the electronics used in 40m green locking.
Contents
- Overview of green electronics
- VCO for frequency tracking
- PDH box
- frequency counter
- digital channel assign
- wideband RFPD for green PLL
- DC PDs
- digital front end filters
- Thermal feedback LPF
- Function Generator
- Summing Amplifier
- Temperature Controller for doubling oves
- RF stuff
- Power Supply and Cables
- RS232 serial device server
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
ZFL-1000 from mini circuit or similar families
- attachment:zfl1000.png
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
15V and 24V lines