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<<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram design for the end,height=200)>>
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== outline ==
 
 . Preliminary design for the electronics used in 40m green locking.

<<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>>

[[BR]]
[[BR]]
-----
== VCO ==
 . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.

 
-----
[[BR]]
== PDH box ==

 . what kind of modification

[[BR]]
-----
== frequency counter ==

 .SR620 is employed to read out the frequency of the beat signal.

attachment:SR620.png

||<-3> '''''setting parameters''''' ||
|| readout range || || MHz ||
|| DAC bit resolution || || ||
|| noise || || ||


[[BR]]
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== digital channel assign ==

<<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>>


[[BR]]
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== digital front end==  . what is the specification for each channel

[[BR]]
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== 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 at https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD

=== frequency response ===
attachment:RFPD_tf.png

=== noise performance ===
attachment:RFPDnoise.png

[[BR]]
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== digital front end ==

 . anti-aliasing filter
 
 . anti-imaging filter

Electronics

outline

  • Preliminary design for the electronics used in 40m green locking.

electronics_diagram.png

BR BR

VCO

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

BR

PDH box

  • what kind of modification

BR

frequency counter

  • SR620 is employed to read out the frequency of the beat signal.

attachment:SR620.png

setting parameters

readout range

MHz

DAC bit resolution

noise

BR

digital channel assign

green_digital.png

BR

whitening filter

  • 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.

frequency response

attachment:RFPD_tf.png

noise performance

attachment:RFPDnoise.png

BR

digital front end

  • anti-aliasing filter
  • anti-imaging filter

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