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Phase Lock Loop Suppression
PLL Suppression
Parameters
Document Part No. E5500-90024Ed. 1.0
Selecting "PLL Suppression Graph" on the View menu causes the
software to display the PLL Suppression Curve plot, as shown in
Figure
16-1, when it is verified during measurement calibration. The
plot appears whether or not an accuracy degradation occurs.
Figure 16-1 PLL Suppression Verification Graph
The following measurement parameters are displayed along with the
PLL Suppression Curve.
PLL Gain Change
This is the amount of gain change required to fit the Theoretical Loop
Suppression curve to the measured loop suppression. A PLL Gain
Change of greater than 1 dB creates an accuracy degradation (ACCY.
DEGRADED) error. If an accuracy degradation is detected, the
amount of error is determined from either the PLL Gain Change or
the Maximum Error, which ever is larger. The degradation itself is 1
dB less than the greater of these.
E5500 Phase Noise Measurement System Version A.02.00
Advanced Software Features
Phase Lock Loop Suppression
16
16-3
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