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Document Part No. E5500-90024Ed. 1.0
There are four different curves available for the this graph (for more
information about loop suppression verification, refer to
"Advanced Software Features"):
a
"Measured" loop suppression curve - this is the result of the
loop suppression measurement performed by the E5500
system;
b
"Smoothed" measured suppression curve - this is a curve-fit
representation of the measured results, it is used to compare
with the "theoretical" loop suppression;
c
"Theoretical" suppression curve - this is the predicted loop
suppression based on the initial loop parameters
defined/selected for this particular measurement (kphi, kvco,
loop bandwidth, filters, gain, etc).
d
"Adjusted" theoretical suppression curve - this is the new
"adjusted" theoretical value of suppression for this
measurement - it is based on changing loop parameters (in
the theoretical response) to match the "smoothed" measured
curve as closely as possible;
When the measurement is complete, refer to
Your Measurement Results" for help in evaluating your measurement
results.
Figure 7-22
shows a typical phase noise curve for a free-running RF
Oscillator.
E5500 Phase Noise Measurement System Version A.02.00
Absolute Measurement Examples
Free-Running RF Oscillator
Chapter
Chapter
15, "Evaluating
7
16,
7-31
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