N5511A Phase Noise Test System User’s Guide 171
Residual and Additive Noise Measurement Fundamentals
What is Residual Noise?
For a dual channel cross-correlated measurement,
measurement theory holds. The stimulus signal is split to the LO inputs of each
of the two phase detectors. Similarly, the signal that passes through the DUT is
split to the RF inputs of each of the two phase detectors. Quadrature is
established separately for each of the phase the detectors, thus requiring two
phase shifters. The output of each phase detector is the additive noise of the
DUT, and any additive noise corresponding to internal amplifiers in each of the
channels is removed by cross-correlation.
Figure 7-5
Dual Channel Configuration
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