Differences between revisions 7 and 25 (spanning 18 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

Thermal compensation LPF

circuit diagram

attachment:thermalLPF.png

expected transfer function of composed frequency actuator

attachment:thermal_actuator.png

Function Generator

To get a phase modulation imposed on the end IR lasers, a function generator is needed.

SR___

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 7 as of 2010-04-30 20:35:41 → 
  Size: 313
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 25 as of 2010-11-25 00:03:47 → ⇥
  Size: 2314
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 3:
-Preliminary design for the electronics used in 40m green locking.
+== outline ==
 
 . Preliminary design for the electronics used in 40m green locking.
-Line 5:
+Line 7:
-<<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram design for the end,height=400)>>
+<<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
-Line 8:
+Line 22:
-== VCO ==
-Line 10:
+Line 23:
+-----
[[BR]]
-Line 11:
+Line 26:
+=== Filter Shape ===
-Line 12:
+Line 28:
-== frequency discriminator ==
+=== Noise performance ===
-Line 14:
+Line 30:
+=== 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]]
-----
-Line 16:
+Line 61:
+ . 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 ===
 attachment:PDA36A.png

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

[[BR]]
-----
-Line 17:
+Line 92:
+ . anti-aliasing filter
 
 . anti-imaging filter

[[BR]]
-----
== Thermal compensation LPF ==
=== circuit diagram ===
attachment:thermalLPF.png

=== expected transfer function of composed frequency actuator ===
attachment:thermal_actuator.png
 
[[BR]]
== Function Generator ==
 To get a phase modulation imposed on the end IR lasers, a function generator is needed.
=== SR___ ===

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