Differences between revisions 1 and 20 (spanning 19 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

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 1 as of 2010-04-30 20:28:56 → 
  Size: 17
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 20 as of 2010-11-24 23:53:28 → ⇥
  Size: 1947
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+== 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 ==
=== 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



-----
[[BR]]
== PDH box ==
=== Filter Shape ===

=== Noise performance ==

=== LPF for RF cutoff ===

=== Low frequency mixer ===

=== Remotely controlled Boost switch ===

[[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]]
-----
== digital channel assign ==

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


[[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.
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

[[BR]]
-----
== DC PDs ==
=== PDA36A ===

||<-4> parameters ||
|| trans impedance gain || || [V/A] ||
|| responsibility || || [A/W]||
|| quantum efficiency || || [%]||

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

 . anti-aliasing filter
 
 . anti-imaging filter

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