## page was renamed from Upgrade 09/GreenLock/Electronics
= Overview of green electronics =
 . Preliminary design for the electronics used in 40m green locking.

[[Upgrade 09/GreenLock/Electronics/electronics_diagram|{{attachment:electronics_diagram.png||height=400}}]]<<TableOfContents(2)>><<BR>><<BR>>
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= VCO for frequency tracking =
== VCO range ==
 . Synergy VCO part number XXX has 1.2MHz/V VCO range.

{{attachment:VCO_range.png}}

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

{{attachment:VCO_filter.png}}

== Noise performance ==
== Capture range and Lock range ==
 . According to a simple calculations...

== lock detection and boost ==
 . rms detection

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= PDH box =
== Filter Shape ==
{{attachment:TF_PDH.png}}

== Open loop transfer function ==
Measured on 22 Dec 2015, with the average level of green transmission at 0.457.

{{attachment:Y_PDH_OLTF.pdf||width=700}}

== Noise performance ==
== LPF for RF cutoff ==
== Remotely controlled Boost switch ==
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= 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 || || ||


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= digital channel assign =
[[Upgrade 09/GreenLock/Electronics/digital_channel|{{attachment:green_digital.png||height=400}}]]<<BR>>
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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]]

[[attachment:Hartmut_RFPD.jpg|{{attachment:Hartmut_RFPD.jpg||height=400}}]]

 . EG&G SGD-444A Si PIN PD [[attachment:SGD-444A.pdf]]

== 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}}

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= DC PDs =
== PDA36A ==
 . {{attachment:PDA36A.png}}

The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range.

|| ''''' parameters ''''' || || ||
|| Detector || Si PIN || ||
|| trans impedance gain || 1.5k - 475k (switchable)|| [V/A] ||
|| responsibility || 0.3 || [A/W] at 532 nm ||
|| output impedance ||  50 || [Ohm] ||
|| Output Voltage || 0-5 || [V] with 50 Ohm termination ||
|| Band Width || 17 || [MHz] ||
|| Dark noise ||    ||  nV/sqrtHz     ||


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= digital front end filters =
 . anti-aliasing filter

 . anti-imaging filter

 . whitening filter

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= Thermal feedback LPF =
== circuit diagram ==
{{attachment:thermalLPF.png}}

== expected transfer function of compound frequency actuator ==
{{attachment:thermal_actuator.png}}

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

=== SR___ ===
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= Summing Amplifier =
In order to send a feedback signal and modulation signal to the laser PZT at the same time, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. Currently this is taken place by SR560.

== Diagram ==
== noise performance ==
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= Temperature Controller for doubling oves =
 . ''' TC200 ''' from Thorlabs
 . {{attachment:tc200.jpg}}
 . Manual (USB connector) [[attachment:TC200-Manual.pdf]]
 . Manual (RS-232 connector) [[attachment:TC200-Manual-RS232.pdf]]
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= RF stuff =
== low noise amplifier ==
 . ''' ZFL-1000 ''' from mini circuit or similar families
 . {{attachment:zfl1000.png}}

== mid power amplifier ==
== power splitter ==
 . ''' ZFRSC-42 ''' from mini circuit. DC-4.2GHz
 . {{attachment:k18.jpg}}

== DC block ==
 . ''' BLK-89''' from mini circuit. 50 Ohm, 100kHz-8GHz
 . {{attachment:ff888.jpg}}

== Low frequency mixer ==
 . ''' ZAD-8''' from mini circuit. 500Hz-10MHz.
 . {{attachment:m22.jpg}}

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= RS232 serial device server =
 . here are the candidates
 . ''' 5100A ''' from Moxa.
 . ''' SeaLink ''' from SeaLevel
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= Vertex BeatBox =

 . [[attachment:vertex_green_beatbox.pdf]]
 . [[attachment:vertex_green_beatnox.graffle]]
 . [[attachment:freq_divider.pdf]]
 . [[attachment:freq_divider.graffle]]