Differences between revisions 56 and 59 (spanning 3 versions)
⇤ ← Revision 56 as of 2011-11-24 07:03:34 →
Size: 3859
Editor: KiwamuIzumi
Comment:
← Revision 59 as of 2012-01-03 23:02:45 → ⇥
Size: 4283
Editor: localhost
Comment: converted to 1.6 markup
Deletions are marked like this. Additions are marked like this.
Line 5: Line 5:
<<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>>
Line 11: Line 11:
attachment:VCO_range.png {{attachment:VCO_range.png}}
Line 16: Line 16:
attachment:VCO_filter.png {{attachment:VCO_filter.png}}
Line 25: Line 25:
[[BR]] <<BR>>
Line 29: Line 29:
attachment:TF_PDH.png {{attachment:TF_PDH.png}}
Line 34: Line 34:
[[BR]] <<BR>>
Line 39: Line 39:
attachment:SR620.png {{attachment:SR620.png}}
Line 47: Line 47:
[[BR]] <<BR>>
Line 50: Line 50:
<<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>>
Line 55: Line 55:
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]]
Line 57: Line 57:
<<ImageLink(Hartmut_RFPD.jpg,height=400)>> [[attachment:Hartmut_RFPD.jpg|{{attachment:Hartmut_RFPD.jpg||height=400}}]]
Line 59: Line 59:
 . EG&G SGD-444A Si PIN PD attachment:SGD-444A.pdf  . EG&G SGD-444A Si PIN PD [[attachment:SGD-444A.pdf]]
Line 62: Line 62:
attachment:RFPD_tf.png {{attachment:RFPD_tf.png}}
Line 65: Line 65:
attachment:RFPDnoise.png {{attachment:RFPDnoise.png}}
Line 67: 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}}
Line 69: Line 69:
[[BR]] <<BR>>
Line 73: Line 73:
 . attachment:PDA36A.png  . {{attachment:PDA36A.png}}
Line 77: Line 77:
|| ''''' parameters ''''' ||
|| Detector || Si PIN ||
|| trans impedance gain || || [V/A] ||
|| responsibility || || [A/W] ||
|| quantum efficiency || || [%] ||		 || ''''' parameters ''''' || || ||
|| Detector || Si PIN || ||
|| trans impedance gain || 1.5k - 475k (switchable)|| [V/A] ||
|| responsibility || 0.3 || [A/W] at 532 nm ||
Line 83: Line 82:
|| Output Voltage || 0-5 || [V] with 50 Ohm termination ||
|| Band Width || 17 || [MHz] ||
|| Dark noise || || nV/sqrtHz ||
Line 85: Line 87:
[[BR]] <<BR>>
Line 94: Line 96:
[[BR]] <<BR>>
Line 98: Line 100:
attachment:thermalLPF.png {{attachment:thermalLPF.png}}
Line 101: Line 103:
attachment:thermal_actuator.png {{attachment:thermal_actuator.png}}
Line 103: Line 105:
[[BR]] <<BR>>
Line 109: Line 111:
[[BR]] <<BR>>
Line 115: Line 117:
[[BR]] <<BR>>
Line 119: Line 121:
 . attachment:tc200.jpg  . {{attachment:tc200.jpg}}
Line 121: Line 123:
[[BR]] <<BR>>
Line 126: Line 128:
 . attachment:zfl1000.png  . {{attachment:zfl1000.png}}
Line 131: Line 133:
 . attachment:k18.jpg  . {{attachment:k18.jpg}}
Line 135: Line 137:
 . attachment:ff888.jpg  . {{attachment:ff888.jpg}}
Line 139: Line 141:
 . attachment:m22.jpg  . {{attachment:m22.jpg}}
Line 141: Line 143:
[[BR]] <<BR>>
Line 151: Line 153:
 . attachment:vertex_green_beatbox.pdf
 . attachment:vertex_green_beatnox.graffle
 . attachment:freq_divider.pdf
 . attachment:freq_divider.graffle		  . [[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.

Upgrade 09/GreenLock/Electronics/electronics_diagram

Contents

  1. Overview of green electronics
  2. VCO for frequency tracking
    1. VCO range
    2. Filter respons
    3. Noise performance
    4. Capture range and Lock range
    5. lock detection and boost
  3. PDH box
    1. Filter Shape
    2. Noise performance
    3. LPF for RF cutoff
    4. Remotely controlled Boost switch
  4. frequency counter
  5. digital channel assign
  6. wideband RFPD for green PLL
    1. frequency response
    2. noise performance
  7. DC PDs
    1. PDA36A
  8. digital front end filters
  9. Thermal feedback LPF
    1. circuit diagram
    2. expected transfer function of compound frequency actuator
  10. Function Generator
  11. Summing Amplifier
    1. Diagram
    2. noise performance
  12. Temperature Controller for doubling oves
  13. RF stuff
    1. low noise amplifier
    2. mid power amplifier
    3. power splitter
    4. DC block
    5. Low frequency mixer
  14. RS232 serial device server
  15. Vertex BeatBox



VCO for frequency tracking

VCO range

  • Synergy VCO part number XXX has 1.2MHz/V VCO range.

VCO_range.png

Filter respons

  • 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.

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

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.

SR620.png

setting parameters

readout range

MHz

DAC bit resolution

noise


digital channel assign

Upgrade 09/GreenLock/Electronics/digital_channel

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

attachment:Hartmut_RFPD.jpg

frequency response

RFPD_tf.png

noise performance

RFPDnoise.png

Here is the noise model for the RFPD using liso.


DC PDs

PDA36A

  • 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


digital front end filters

  • anti-aliasing filter
  • anti-imaging filter
  • whitening filter


Thermal feedback LPF

circuit diagram

thermalLPF.png

expected transfer function of compound frequency actuator

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

  • tc200.jpg


RF stuff

low noise amplifier

  • ZFL-1000 from mini circuit or similar families

  • zfl1000.png

mid power amplifier

power splitter

  • ZFRSC-42 from mini circuit. DC-4.2GHz

  • k18.jpg

DC block

  • BLK-89 from mini circuit. 50 Ohm, 100kHz-8GHz

  • ff888.jpg

Low frequency mixer

  • ZAD-8 from mini circuit. 500Hz-10MHz.

  • m22.jpg


RS232 serial device server

Vertex BeatBox

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