User`s guide

Expanding Your Measurement Experience 4
Agilent E5505A User’s Guide 77
There are four different curves for the this graph. (For more information about
loop suppression verification, refer to Chapter 15, “Advanced Software
Features”).
• “Measured” loop suppression curve—this is the result of the loop
suppression measurement performed by the E5505A system.
• “Smoothed” measured suppression curve—this is a curve-fit representation
of the measured results, it is used to compare with the “theoretical” loop
suppression.
• “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, and others).
• “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 Chapter 14, “Evaluating Your
Measurement Results
for help in evaluating your measurement results.
Figure 46 on page 78 shows a typical phase noise curve for an RF Synthesizer.
Figure 45 Selecting suppression