Differences between revisions 32 and 63 (spanning 31 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

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

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 32 as of 2010-11-25 00:20:13 → 
  Size: 2829
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 63 as of 2017-04-20 01:58:36 → ⇥
  Size: 4570
  Editor: RanaadhikariATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-= 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)>>

<<TableOfContents(2)>>


[[BR]]
[[BR]]
+[[Upgrade 09/GreenLock/Electronics/electronics_diagram|{{attachment:electronics_diagram.png||height=400}}]]<<TableOfContents(2)>><<BR>><<BR>>
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+Line 10:
-attachment:VCO_range.png
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+Line 11:
+{{attachment:VCO_range.png}}
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+Line 16:
-attachment:VCO_filter.png
+{{attachment:VCO_filter.png}}
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+Line 19:
+== Capture range and Lock range ==
 . According to a simple calculations...
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+Line 25:
+<<BR>>
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+Line 27:
-[[BR]]
-Line 35:
+Line 29:
-attachment:TF_PDH.png
+{{attachment:TF_PDH.png}}

== Open loop transfer function ==
Measured on 22 Dec 2015, with the average level of green transmission at 0.457.

{{attachment:Y_PDH_OLTF.pdf||width=700}}
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+Line 37:
-Line 40:
+Line 38:
-== Low frequency mixer ==
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+Line 39:
-[[BR]]
+<<BR>>
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+Line 42:
+ . SR620 is employed to read out the frequency of the beat signal.
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+Line 44:
- .SR620 is employed to read out the frequency of the beat signal.
+{{attachment:SR620.png}}
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+Line 46:
-attachment:SR620.png

||<-3> '''''setting parameters''''' ||
+|| '''''setting parameters''''' ||
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+Line 52:
-[[BR]]
+<<BR>>
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+Line 55:
-<<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 59:
-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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+Line 67:
-attachment:RFPD_tf.png
+{{attachment:RFPD_tf.png}}
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+Line 70:
-attachment:RFPDnoise.png
+{{attachment:RFPDnoise.png}}
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+Line 72:
-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 74:
-[[BR]]
+<<BR>>
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+Line 78:
- attachment:PDA36A.png
+ . {{attachment:PDA36A.png}}
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+Line 80:
-||<-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 92:
+Line 82:
-[[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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+Line 97:
- . anti-aliasing filter
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+Line 101:
-[[BR]]
+<<BR>>
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+Line 105:
-attachment:thermalLPF.png
+{{attachment:thermalLPF.png}}
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+Line 107:
-== 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 113:
- 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 116:
-[[BR]]
+<<BR>>
-Line 120:
+Line 118:
-In order to send a feedback signal and modulation signal to the laser PZT,
it is desired to have a summing amplifier.
The amplifier should handle the signal from DC to 200kHz.
+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 121:
-Line 127:
+Line 122:
-[[BR]]
+<<BR>>
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+Line 125:
-. TC200 from Thorlabs

[[BR]]
+ . ''' TC200 ''' from Thorlabs
 . {{attachment:tc200.jpg}}
 . Manual (USB connector) [[attachment:TC200-Manual.pdf]]
 . Manual (RS-232 connector) [[attachment:TC200-Manual-RS232.pdf]]
<<BR>>
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+Line 133:
+ . ''' ZFL-1000 ''' from mini circuit or similar families
 . {{attachment:zfl1000.png}}
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+Line 138:
+ . ''' ZFRSC-42 ''' from mini circuit. DC-4.2GHz
 . {{attachment:k18.jpg}}
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+Line 142:
+ . ''' BLK-89''' from mini circuit. 50 Ohm, 100kHz-8GHz
 . {{attachment:ff888.jpg}}
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+Line 145:
-[[BR]]
+== Low frequency mixer ==
 . ''' ZAD-8''' from mini circuit. 500Hz-10MHz.
 . {{attachment:m22.jpg}}

<<BR>>
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+Line 151:
-= 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]]