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← Revision 63 as of 2017-04-20 01:58:36 ⇥
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| = Electronics = == outline == |
## page was renamed from Upgrade 09/GreenLock/Electronics = Overview of green electronics = |
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| <<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>> | [[Upgrade 09/GreenLock/Electronics/electronics_diagram|{{attachment:electronics_diagram.png||height=400}}]]<<TableOfContents(2)>><<BR>><<BR>> ----- = VCO for frequency tracking = == VCO range == . Synergy VCO part number XXX has 1.2MHz/V VCO range. |
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| [[BR]] [[BR]] ----- == VCO == === Filter respons === |
{{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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| <<BR>> ----- = PDH box = == Filter Shape == {{attachment:TF_PDH.png}} |
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| == Open loop transfer function == Measured on 22 Dec 2015, with the average level of green transmission at 0.457. |
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| {{attachment:Y_PDH_OLTF.pdf||width=700}} == Noise performance == == LPF for RF cutoff == == Remotely controlled Boost switch == <<BR>> |
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| [[BR]] == PDH box == === Filter Shape === |
= frequency counter = . SR620 is employed to read out the frequency of the beat signal. |
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| === Noise performance == | {{attachment:SR620.png}} |
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| === 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''''' || |
|| '''''setting parameters''''' || |
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| [[BR]] | <<BR>> |
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| == digital channel assign == | = digital channel assign = [[Upgrade 09/GreenLock/Electronics/digital_channel|{{attachment:green_digital.png||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. |
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| <<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>> | The schematic is available on [[https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD|svn]] [[attachment:Hartmut_RFPD.jpg|{{attachment:Hartmut_RFPD.jpg||height=400}}]] . EG&G SGD-444A Si PIN PD [[attachment:SGD-444A.pdf]] == 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}} The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range. || ''''' parameters ''''' || || || || Detector || Si PIN || || || trans impedance gain || 1.5k - 475k (switchable)|| [V/A] || || responsibility || 0.3 || [A/W] at 532 nm || || output impedance || 50 || [Ohm] || || Output Voltage || 0-5 || [V] with 50 Ohm termination || || Band Width || 17 || [MHz] || || Dark noise || || nV/sqrtHz || |
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| [[BR]] | <<BR>> |
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| == whitening filter == | = digital front end filters = . anti-aliasing filter |
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| . 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 |
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| [[BR]] | . whitening filter <<BR>> |
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| == Thermal compensation LPF == === circuit diagram === attachment:thermalLPF.png |
= Thermal feedback LPF = == circuit diagram == {{attachment:thermalLPF.png}} |
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| === expected transfer function of composed frequency actuator === attachment:thermal_actuator.png |
== expected transfer function of compound frequency actuator == {{attachment:thermal_actuator.png}} |
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| [[BR]] | <<BR>> |
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| == Power Supply and Cables == === HV cables (-150V) for photodiode bias === === 15V and 24V lines === |
= 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}} . Manual (USB connector) [[attachment:TC200-Manual.pdf]] . Manual (RS-232 connector) [[attachment:TC200-Manual-RS232.pdf]] <<BR>> ----- = 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}} <<BR>> ----- = RS232 serial device server = . here are the candidates . ''' 5100A ''' from Moxa. . ''' SeaLink ''' from SeaLevel ----- = Vertex BeatBox = . [[attachment:vertex_green_beatbox.pdf]] . [[attachment:vertex_green_beatnox.graffle]] . [[attachment:freq_divider.pdf]] . [[attachment:freq_divider.graffle]] |
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
- RS232 serial device server
- Vertex BeatBox
VCO for frequency tracking
VCO range
- Synergy VCO part number XXX has 1.2MHz/V VCO range.
Filter respons
- 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
Noise performance
Capture range and Lock range
- According to a simple calculations...
lock detection and boost
- rms detection
PDH box
Filter Shape
Open loop transfer function
Measured on 22 Dec 2015, with the average level of green transmission at 0.457.
Noise performance
LPF for RF cutoff
Remotely controlled Boost switch
frequency counter
- SR620 is employed to read out the frequency of the beat signal.
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 svn
EG&G SGD-444A Si PIN PD SGD-444A.pdf
frequency response
noise performance
Here is the noise model for the RFPD using liso. 
DC PDs
PDA36A
The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range.
parameters |
|
|
Detector |
Si PIN |
|
trans impedance gain |
1.5k - 475k (switchable) |
[V/A] |
responsibility |
0.3 |
[A/W] at 532 nm |
output impedance |
50 |
[Ohm] |
Output Voltage |
0-5 |
[V] with 50 Ohm termination |
Band Width |
17 |
[MHz] |
Dark noise |
|
nV/sqrtHz |
digital front end filters
- anti-aliasing filter
- anti-imaging filter
- whitening filter
Thermal feedback LPF
circuit diagram
expected transfer function of compound frequency actuator
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
Manual (USB connector) TC200-Manual.pdf
Manual (RS-232 connector) TC200-Manual-RS232.pdf
RF stuff
low noise amplifier
ZFL-1000 from mini circuit or similar families
mid power amplifier
power splitter
ZFRSC-42 from mini circuit. DC-4.2GHz
DC block
BLK-89 from mini circuit. 50 Ohm, 100kHz-8GHz
Low frequency mixer
ZAD-8 from mini circuit. 500Hz-10MHz.
RS232 serial device server