Differences between revisions 14 and 18 (spanning 4 versions)

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/]

RF Transimpedance

attachment:transimpedance.png

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

Resonant 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

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

11 MHz Resonance

attachment: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

attachment: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

attachment: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

attachment:noise.png

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

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.

RF Behavior with No Light

attachment:timeseries.png

attachment:dark_spectrum.png

Picture of Photodiode

attachment:POX.jpg

Picture taken on 12/13/2010.

-  ⇤ ← Revision 14 as of 2011-01-19 11:40:18 → 
  Size: 1701
  Editor: JenneDriggers
  Comment:
+   ← Revision 18 as of 2011-01-20 00:51:22 → ⇥
  Size: 2213
  Editor: JenneDriggers
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 11:
-|| Resonance Frequency || Transimpedance at Resonance || Q ||
+|| Resonant Frequency || Transimpedance at Resonance || Q ||
 Line 18:
+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''.
-Line 22:
+Line 24:
-f,,0,, = (11.14 +- 0.01) MHz
+''f'',,0,, = (11.14 +- 0.01) MHz
-Line 24:
+Line 26:
-Gamma = (764 +- 1) kHz
+''Gamma'' = (764 +- 1) kHz
-Line 26:
+Line 28:
-R,,0,, = (8.38 +- 0.01) x 10^8^ Hz Ohms
+''R'',,0,, = (8.38 +- 0.01) x 10^8^ Hz Ohms
-Line 28:
+Line 30:
-C = (11.14 +- 0.05) Ohms
+''C'' = (11.14 +- 0.05) Ohms
-Line 36:
+Line 38:
-f,,0,, = (22.68 +- 0.01) MHz
+''f'',,0,, = (22.68 +- 0.01) MHz
-Line 38:
+Line 40:
-Gamma = (820 +- 1) kHz
+''Gamma'' = (820 +- 1) kHz
-Line 40:
+Line 42:
-R,,0,, = (-5.64 +- 0.01) x 10^6^ Hz Ohms
+''R'',,0,, = (-5.64 +- 0.01) x 10^6^ Hz Ohms
-Line 42:
+Line 44:
-C = (23.44 +- 0.01) Ohms
+''C'' = (23.44 +- 0.01) Ohms
-Line 50:
+Line 52:
-f,,0,, = (55.29 +- 0.01) MHz
+''f'',,0,, = (55.29 +- 0.01) MHz
-Line 52:
+Line 54:
-Gamma = (1.74 +- 0.01) MHz
+''Gamma'' = (1.74 +- 0.01) MHz
-Line 54:
+Line 56:
-R,,0,, = (-9.98 +- 0.01) x 10^5^ Hz Ohms
+''R'',,0,, = (-9.98 +- 0.01) x 10^5^ Hz Ohms
-Line 56:
+Line 58:
-C = (1.62 +- 0.01) Ohms
+''C'' = (1.62 +- 0.01) Ohms
-Line 66:
+Line 68:
-Z,,RF,, = (2.07 +- 0.01) kOhms
+''Z'',,RF,, = (2.07 +- 0.01) kOhms
-Line 68:
+Line 70:
-I,,d,, = (24.7 +- 0.6) mA
+''I'',,d,, = (247 +- 6) uA
-Line 71:
+Line 73:
+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.