Differences between revisions 35 and 59 (spanning 24 versions)

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
1. frequency response
2. noise performance
DC PDs
1. PDA36A
digital front end filters
Thermal feedback LPF
1. circuit diagram
2. expected transfer function of compound frequency actuator
Function Generator
Summing Amplifier
1. Diagram
2. noise performance
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

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

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

here are the candidates
5100A from Moxa.
SeaLink from SeaLevel

Vertex BeatBox

Advanced_Techniques/Green_Locking/Electronics (last edited 2017-04-20 01:58:36 by RanaadhikariATligoDOTorg)

-  ⇤ ← Revision 35 as of 2010-11-25 00:23:59 → 
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+   ← Revision 59 as of 2012-01-03 23:02:45 → ⇥
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  Editor: localhost
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+Additions are marked like this.
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+## page was renamed from Upgrade 09/GreenLock/Electronics
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-<<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>>

<<TableOfContents(2)>>


[[BR]]
[[BR]]
+[[Upgrade 09/GreenLock/Electronics/electronics_diagram|{{attachment:electronics_diagram.png||height=400}}]]<<TableOfContents(2)>><<BR>><<BR>>
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-attachment:VCO_range.png
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+{{attachment:VCO_range.png}}
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-attachment:VCO_filter.png
+{{attachment:VCO_filter.png}}
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+== Capture range and Lock range ==
 . According to a simple calculations...
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+<<BR>>
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+Line 27:
-[[BR]]
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+Line 29:
-attachment:TF_PDH.png
+{{attachment:TF_PDH.png}}
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+Line 32:
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+Line 33:
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+Line 34:
-[[BR]]
+<<BR>>
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+Line 37:
+ . SR620 is employed to read out the frequency of the beat signal.
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+Line 39:
- .SR620 is employed to read out the frequency of the beat signal.
+{{attachment:SR620.png}}
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+Line 41:
-attachment:SR620.png

||<-3> '''''setting parameters''''' ||
+|| '''''setting parameters''''' ||
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+Line 47:
-[[BR]]
+<<BR>>
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-<<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>>


[[BR]]
+[[Upgrade 09/GreenLock/Electronics/digital_channel|{{attachment:green_digital.png||height=400}}]]<<BR>>
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+Line 54:
-The schematic is available on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]
+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]]
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-attachment:RFPD_tf.png
+{{attachment:RFPD_tf.png}}
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-attachment:RFPDnoise.png
+{{attachment:RFPDnoise.png}}
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+Line 67:
-Here is the noise model for the RFPD using liso.
attachment:liso_RFPD.png
+Here is the noise model for the RFPD using liso. {{attachment:liso_RFPD.png}}
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+Line 69:
-[[BR]]
+<<BR>>
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- attachment:PDA36A.png
+ . {{attachment:PDA36A.png}}
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+Line 75:
-||<-4> ''''' parameters ''''' ||
|| trans impedance gain || || [V/A] ||
|| responsibility || || [A/W]||
|| quantum efficiency || || [%]||
+The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range.
-Line 91:
+Line 77:
-[[BR]]
+|| ''''' 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     ||


<<BR>>
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-= digital front end filters=
+= digital front end filters =
 . anti-aliasing filter
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- . anti-aliasing filter
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+Line 96:
-[[BR]]
+<<BR>>
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+Line 100:
-attachment:thermalLPF.png
+{{attachment:thermalLPF.png}}
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+Line 102:
-== expected transfer function of composed frequency actuator ==
attachment:thermal_actuator.png
 
[[BR]]
+== expected transfer function of compound frequency actuator ==
{{attachment:thermal_actuator.png}}

<<BR>>
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+Line 108:
- To get a phase modulation imposed on the end IR lasers, a function generator is needed.
+ . To get a phase modulation imposed on the end IR lasers, a function generator is needed.
-Line 115:
+Line 111:
-[[BR]]
+<<BR>>
-Line 119:
+Line 113:
-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.
+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.
-Line 125:
+Line 116:
-Line 127:
+Line 117:
-[[BR]]
+<<BR>>
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+Line 120:
-. TC200 from Thorlabs
+ . ''' TC200 ''' from Thorlabs
 . {{attachment:tc200.jpg}}
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+Line 123:
-[[BR]]
+<<BR>>
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+Line 127:
+ . ''' ZFL-1000 ''' from mini circuit or similar families
 . {{attachment:zfl1000.png}}
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+Line 132:
+ . ''' ZFRSC-42 ''' from mini circuit. DC-4.2GHz
 . {{attachment:k18.jpg}}
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+Line 136:
+ . ''' BLK-89''' from mini circuit. 50 Ohm, 100kHz-8GHz
 . {{attachment:ff888.jpg}}
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+Line 140:
- . ZAD-8 from mini circuit
+ . ''' ZAD-8''' from mini circuit. 500Hz-10MHz.
 . {{attachment:m22.jpg}}
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-[[BR]]
+<<BR>>
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-= Power Supply and Cables =
== HV cables (-150V) for photodiode bias ==
== 15V and 24V lines ==
+= 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]]