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Residual Measurement Fundamentals
8
Basic Assumptions Regarding Residual Phase Noise Measurements
If the UUT's are identical, a possible (but not recommended)
assumption is that the noise of each UUT is half the measured result,
or 3 dB less. All that really can be concluded is that the noise level of
one of the UUT's is at least 3 dB lower than the measured result at
any particular offset frequency.
If a more precise determination is required at any particular offset
frequency, a third UUT must also be measured against the other two
UUT's. The data from each of the three measurements can then be
processed by the phase noise software to give the noise of each of the
individual UUT's. See
Figure
8-4.
Figure 8-4 Measurement Setup for Two Similar UUTs
Document Part No. E5500-90024Ed. 1.0
E5500 Phase Noise Measurement System Version A.02.00
8-5
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