Differences between revisions 13 and 22 (spanning 9 versions)

Electronics

outline

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

BR BR

VCO

Filter respons

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

Noise performance

lock detection and boost

rms detection

PDH box

Filter Shape

=== Noise performance ==

LPF for RF cutoff

Low frequency mixer

Remotely controlled Boost switch

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

DC PDs

PDA36A

attachment:PDA36A.png

parameters
trans impedance gain		[V/A]
responsibility		[A/W]
quantum efficiency		[%]

digital front end

anti-aliasing filter
anti-imaging filter

Power Supply and Cables

HV cables (-150V) for photodiode bias

15V and 24V lines

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 22 as of 2010-11-24 23:56:08 → ⇥
  Size: 1982
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 10:
+[[BR]]
-----
== VCO ==
=== Filter respons ===
 . 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.
-Line 11:
+Line 16:
-== VCO ==
+=== Noise performance ===
-Line 13:
+Line 18:
- . build by ourselves
+=== lock detection and boost ===
 . rms detection
-Line 15:
+Line 21:
- . need a specification
+-----
[[BR]]
== PDH box ==
=== Filter Shape ===

=== Noise performance ==

=== LPF for RF cutoff ===

=== Low frequency mixer ===

=== Remotely controlled Boost switch ===
-Line 18:
+Line 37:
-== PDH box ==
+-----
== frequency counter ==
-Line 20:
+Line 40:
- . what kind of modification
+ .SR620 is employed to read out the frequency of the beat signal.
-Line 22:
+Line 42:
-[[BR]]
== frequency discriminator ==
+attachment:SR620.png
-Line 25:
+Line 44:
- . build by ourselves
+||<-3> '''''setting parameters''''' ||
|| readout range || || MHz ||
|| DAC bit resolution || || ||
|| noise || || ||
-Line 29:
+Line 51:
+-----
-Line 35:
+Line 58:
+-----
-Line 40:
+Line 64:
+-----
== 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]
-Line 41:
+Line 69:
-== 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 72:
- . 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
-Line 48:
+Line 79:
+-----
== DC PDs ==
=== PDA36A ===
 attachment:PDA36A.png
-Line 49:
+Line 84:
+||<-4> ''''' parameters ''''' ||
|| trans impedance gain || || [V/A] ||
|| responsibility || || [A/W]||
|| quantum efficiency || || [%]||

[[BR]]
-----
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+Line 96:
+[[BR]]
-----
== Power Supply and Cables ==
=== HV cables (-150V) for photodiode bias ===
=== 15V and 24V lines ===