Differences between revisions 8 and 17 (spanning 9 versions)

Electronics

outline

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

BR BR

VCO

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

PDH box

what kind of modification

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

digital channel assign

whitening filter

what is the specification for each 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 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

digital front end

anti-aliasing filter
anti-imaging filter

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

-  ⇤ ← Revision 8 as of 2010-04-30 20:40:12 → 
  Size: 294
  Editor: KiwamuIzumi
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+   ← Revision 17 as of 2010-11-24 23:43:24 → ⇥
  Size: 1371
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-Preliminary design for the electronics used in 40m green locking.
+== outline ==
 
 . Preliminary design for the electronics used in 40m green locking.
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+[[BR]]
[[BR]]
-----
== VCO ==
 . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
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-== VCO ==
+  -----
[[BR]]
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-== frequency discriminator ==
+ . what kind of modification
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+[[BR]]
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== 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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+ . 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 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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+Line 66:
+ . anti-aliasing filter
 
 . anti-imaging filter