Agilent Technologies E5500 Phase Noise Measurement System
16-3
Advanced Software Features
Phase Lock Loop Suppression
Phase Lock Loop Suppression
Selecting “PLL Suppression Graph” on the View menu causes the software
to display the PLL Suppression Curve plot, as shown in the
,
when it is verified during measurement calibration. The plot appears
whether or not an accuracy degradation occurs.
Figure 16-1
PLL Suppression Verification Graph
PLL Suppression
Parameters
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.
