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Comparing Against
Expected Data
Document Part No. E5500-90024Ed. 1.0
Figure 15-1
provides a graphical example of these problems. If one or
more of these problems appear on your graph, refer to the Problem
Solving section for recommended actions.
Figure 15-1 Noise Plot Showing Obvious Problems
If none of the problems listed appears on your graph, there still may
be problems or uncertainties that are not obvious at first glance.
These uncertainties can be evaluated by comparing your
measurement results against the following data:
G
The noise characteristics expected for your unit-under-test.
G
The noise floor and accuracy specifications of the phase noise
test system.
G
The noise characteristics of the signal source used as the
reference source.
The Unit-Under-Test
If you are testing a product for which published specifications exist,
compare the measurement results against the noise and spur
characteristics specified for the product. If the product is operating
correctly, the noise graph provided by the phase noise system should
be within the noise limits specified for the product.
If the device is a prototype or breadboard circuit, it may be possible
to estimate its general noise characteristics using the characteristics
of a similar type of circuit operating in a similar manner.
E5500 Phase Noise Measurement System Version A.02.00
Evaluating Your Measurement Results
Evaluating the Results
15
15-3
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