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
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:
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
RF Behavior with No Light
Picture of Photodiode
Picture taken on 12/13/2010.