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6
Absolute Measurement Fundamentals
Minimizing Injection Locking
6-18
E5500 Phase Noise Measurement System Version A.02.00
in this chapter. When the injection locking occurs, the beatnote
will disappear. The injection locking bandwidth is the frequency
of the beatnote just prior to where the injection locking occurs as
the beatnote is tuned toward 0 Hz.
2
Multiply the injection locking bandwidth by 2 to determine the
minimum PLL bandwidth required to prevent the injection
locking from causing the system to lose lock. (To prevent
accuracy degradation, it may be necessary to increase the PLL
bandwidth to 4 X the injection locking bandwidth. The computer
will inform you during the measurement if the possibility of
accuracy degradation exists.)
3
Locate the required PLL bandwidth in
the PTR required for the measurement. (For details on increasing
the PTR, refer to Changing the PTR in this section.
Figure 6-8 Peak Tuning Range (PTR) Required by Injection Locking.
Figure 6-8
to determine
Document Part No. E5500-90024 Ed. 1.0
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