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6
Absolute Measurement Fundamentals
Evaluating Noise Above the Small Angle Line
Figure 6-13 Graph Showing Peak Tuning Range Requirements for Noise that Exceeds the Small Angle Limit
6-24
E5500 Phase Noise Measurement System Version A.02.00
frequency and level of the noise. Use the graph in
determine the Peak Tuning Range (PTR) necessary to provide a
sufficient PLL bandwidth to make the measurement.
Measurement Options
If the observed level exceeded the small angle line at any point
beyond the PLL bandwidth set for the measurement, you will need to
consider one of the following measurement options.
1
Evaluate your source using the noise data provided by the RF
analyzer in the procedure you just performed.
2
Increase the PTR if possible, to provide a sufficient PLL
bandwidth to suppress the noise. (For information on increasing
the PTR, refer to Changing the PTR in this section.)
3
Reduce the noise level of the signal sources.
4
Use the Discriminator technique to measure the phase noise level
of your source.
Figure 6-13
Document Part No. E5500-90024 Ed. 1.0
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