Diff for "Electronics/POX11"

Differences between revisions 2 and 27 (spanning 25 versions)

The data for the following measurements is located at /svn/trunk/docs/upgrade08/RFsystem/RFphotodiodes/POX/

RF Transimpedance

The above fit was done in LISO in root mode. The results of the fit are the following:

factor = (-2.1 +- 0.2) Ohms

delay = (9.57 +- 0.02) ns

five poles:

frequency (MHz)	Q
11.133 +- 0.003	14.3 +- 0.1
11.45 +- 0.06	0.595 +- 0.005
25.46 +- 0.02	5.89 +- 0.07
224.33 +-0.02	124 +- 4
100.7 +- 0.9	706.82 +- 0.04

four zeros:

frequency (MHz)	Q
22.67 +- 0.01	35 +- 1
55.4 +- 0.3	(10.0 +- 0.2) x 10⁶
0.93 +- 0.04	3.9 +- 0.6
143 +- 3	631.94 +- 0.04

chi^2/ndf = 432

Alberto's LISO Model

pox_tf.pdf

Fits To Resonance

More detailed transfer functions were measured around the resonance peaks at 11, 22, and 55 MHz. These transfer functions were fit to where f₀ is the resonant frequency and Gamma is the line width. Q is calculated by f₀/Gamma.

11 MHz Resonance

f₀ = (11.14 +- 0.01) MHz

Gamma = (764 +- 1) kHz

R₀ = (8.38 +- 0.01) x 10⁸ Hz Ohms

C = (11.14 +- 0.05) Ohms

chi^2/ndf = 95.4

22 MHz Resonance

f₀ = (22.68 +- 0.01) MHz

Gamma = (820 +- 1) kHz

R₀ = (-5.64 +- 0.01) x 10⁶ Hz Ohms

C = (23.44 +- 0.01) Ohms

chi^2/ndf = 12.7

55 MHz Resonance

f₀ = (55.29 +- 0.01) MHz

Gamma = (1.74 +- 0.01) MHz

R₀ = (-9.98 +- 0.01) x 10⁵ Hz Ohms

C = (1.62 +- 0.01) Ohms

chi^2/ndf = 3.22

Noise

The noise data was fit to with the following results:

Z_RF = (2.07 +- 0.01) kOhms

I_d = (247 +- 6) uA

chi² / ndf = 42

Note that this value for the transimpedance agrees with the above transfer functions since the noise was measured at 11 MHz instead of the resonance frequency of 11.14 MHz.

-  ⇤ ← Revision 2 as of 2010-11-23 08:28:40 → 
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+   ← Revision 27 as of 2012-01-03 23:03:06 → ⇥
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-Deletions are marked like this.
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-= POX =
+## page was renamed from Electronics/POX
The data for the following measurements is located at [[https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/RFsystem/RFphotodiodes/POX/|/svn/trunk/docs/upgrade08/RFsystem/RFphotodiodes/POX/]]

[[attachment:POX_modified_schematic.png|Schematic]]
-Line 5:
+Line 8:
-attachment:transimpedance.png
+{{attachment:transimpedance.png}}

The above fit was done in LISO in root mode. The results of the fit are the following:

factor = (-2.1 +- 0.2) Ohms

delay = (9.57 +- 0.02) ns

five poles:
|| frequency (MHz) || Q ||
|| 11.133 +- 0.003 || 14.3 +- 0.1 ||
|| 11.45 +- 0.06 || 0.595 +- 0.005 ||
|| 25.46 +- 0.02 || 5.89 +- 0.07 ||
|| 224.33 +-0.02 || 124 +- 4 ||
|| 100.7 +- 0.9 || 706.82 +- 0.04 ||

four zeros:
|| frequency (MHz) || Q ||
|| 22.67 +- 0.01 || 35 +- 1 ||
|| 55.4 +- 0.3 || (10.0 +- 0.2) x 10^6^ ||
|| 0.93 +- 0.04 || 3.9 +- 0.6 ||
|| 143 +- 3 || 631.94 +- 0.04 ||

chi^2/ndf = 432

=== Alberto's LISO Model ===

[[attachment:pox_tf.pdf]]

=== Fits To Resonance ===

More detailed transfer functions were measured around the resonance peaks at 11, 22, and 55 MHz. These transfer functions were fit to {{attachment:resfitfunc.png}} where ''f'',,0,, is the resonant frequency and ''Gamma'' is the line width. ''Q'' is calculated by ''f'',,0,,/''Gamma''.

==== 11 MHz Resonance ====

{{attachment:res1.png}}

''f'',,0,, = (11.14 +- 0.01) MHz

''Gamma'' = (764 +- 1) kHz

''R'',,0,, = (8.38 +- 0.01) x 10^8^ Hz Ohms

''C'' = (11.14 +- 0.05) Ohms

chi^2/ndf = 95.4

==== 22 MHz Resonance ====

{{attachment:res2.png}}

''f'',,0,, = (22.68 +- 0.01) MHz

''Gamma'' = (820 +- 1) kHz

''R'',,0,, = (-5.64 +- 0.01) x 10^6^ Hz Ohms

''C'' = (23.44 +- 0.01) Ohms

chi^2/ndf = 12.7

==== 55 MHz Resonance ====

{{attachment:res3.png}}

''f'',,0,, = (55.29 +- 0.01) MHz

''Gamma'' = (1.74 +- 0.01) MHz

''R'',,0,, = (-9.98 +- 0.01) x 10^5^ Hz Ohms

''C'' = (1.62 +- 0.01) Ohms

chi^2/ndf = 3.22
-Line 9:
+Line 85:
-attachment:noise.png
+{{attachment:noise.png}}
-Line 11:
+Line 87:
-The measured dark noise was (21 +- 2) nV/rtHz.
The noise data was fit to  with the following results:
V,,d,, = (21 +- 2) nV/rtHz
Z,,RF,, = (77 +- 3) kOhms
chi^2^ / ndf = 0.006
+The noise data was fit to {{attachment:fitfunc.png}} with the following results:

''Z'',,RF,, = (2.07 +- 0.01) kOhms

''I'',,d,, = (247 +- 6) uA

chi^2^ / ndf = 42

Note that this value for the transimpedance agrees with the above transfer functions since the noise was measured at 11 MHz instead of the resonance frequency of 11.14 MHz.

=== Alberto's LISO Model ===

[[attachment:pox_noise.pdf]]

== RF Behavior with No Light ==

{{attachment:timeseries.png}}

{{attachment:dark_spectrum.png}}

== Picture of Photodiode ==

{{attachment:POX.jpg}}

Picture taken on 12/13/2010.