Differences between revisions 13 and 18 (spanning 5 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 on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]

frequency response

attachment:RFPD_tf.png

noise performance

attachment:RFPDnoise.png

Here is the noise model for the RFPD using liso. attachment:liso_RFPD.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 13 as of 2010-10-13 17:47:32 → 
  Size: 1004
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 18 as of 2010-11-24 23:46:16 → ⇥
  Size: 1447
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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+[[BR]]
-----
== VCO ==
 . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
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-== VCO ==

 . build by ourselves

 . need a specification
+  -----
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-== frequency discriminator ==
+-----
== frequency counter ==
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- . build by ourselves
+ .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 || || ||
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+-----
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+Line 44:
+-----
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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 on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]
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+Line 55:
-== 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
-Line 45:
+Line 58:
- . The schematic is available at https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD
+=== noise performance ===
attachment:RFPDnoise.png

Here is the noise model for the RFPD using liso.
attachment:liso_RFPD.png
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+Line 65:
+-----