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If you are able to locate the beatnote, but it distorts and then disappears as you adjust it
NO T E
towards 0 Hz, your sources are injection locking to each other. Set the beatnote to the
lowest frequency possible before injection locking occurs and then refer to Minimizing
Injection Locking in the Problem Solving section of this chapter for recommended actions.
If you are not able to tune the beatnote to within the capture range due to frequency drift,
NO T E
refer to Tracking Frequency Drift in the Problem Solving section of this chapter for
information about measuring drifting signals.
Making the measurement
1
2
Agilent E5505A User's Guide
Estimate the system's capture range (using the VCO source parameters
entered for this measurement). The estimated VCO tuning constant must be
accurate within a factor of 2. A procedure for Estimating the Tuning
Constant is located in this chapter.
Click the Continue button when you have completed the beatnote check
and are ready to make the measurement.
When the PLL Suppression Curve dialog box appears, select View
Measured Loop Suppression, View Smoothed Loop Suppression, and
View Adjusted Loop Suppression. See
Absolute Measurement Examples
Figure 107
on page 156.
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155
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