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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/]]
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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]]
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attachment:transimpedance.png {{attachment:transimpedance.png}}
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The resonance peaks at 11, 22, and 55 MHz were measured in detail and fit to a resonance curve (see below) with the following results The above fit was done in LISO in root mode. The results of the fit are the following:
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|| Resonance Frequency || Transimpedance at Resonance || Q ||
|| (11.14 +- 0.01) MHz || (2.206 +- 0.001) kOhms || 14.58 +- 0.01 ||
|| (22.68 +- 0.01) MHz || (9.681 +- 0.003) Ohms || 27.66 +- 0.01 ||
|| (55.29 +- 0.01) MHz || (475 +- 2) mOhms || 31.81 +- 0.05 ||		 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]]
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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 resonance frequency and ''Gamma'' is the line width. ''Q'' is calculated by ''f'',,0,,/''Gamma''. 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''.
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attachment:res1.png {{attachment:res1.png}}
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attachment:res2.png {{attachment:res2.png}}
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attachment:res3.png {{attachment:res3.png}}
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attachment:noise.png {{attachment:noise.png}}
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The noise data was fit to attachment:fitfunc.png with the following results: The noise data was fit to {{attachment:fitfunc.png}} with the following results:
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''I'',,d,, = (24.7 +- 0.6) mA ''I'',,d,, = (247 +- 6) uA
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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]]
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attachment:timeseries.png {{attachment:timeseries.png}}
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attachment:dark_spectrum.png {{attachment:dark_spectrum.png}}
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attachment:POX.jpg {{attachment:POX.jpg}}

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

Schematic

RF Transimpedance

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 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 resfitfunc.png where f0 is the resonant frequency and Gamma is the line width. Q is calculated by f0/Gamma.

11 MHz Resonance

res1.png

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

res2.png

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

res3.png

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

noise.png

The noise data was fit to fitfunc.png with the following results:

ZRF = (2.07 +- 0.01) kOhms

Id = (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.

Alberto's LISO Model

pox_noise.pdf

RF Behavior with No Light

timeseries.png

dark_spectrum.png

Picture of Photodiode

POX.jpg

Picture taken on 12/13/2010.

Electronics/POX11 (last edited 2012-01-03 23:03:06 by localhost)