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Agilent Technologies E5500 Phase Noise Measurement System
Reference Graphs and Tables
Approximate System Phase Noise Floor vs. R Port Signal Level
Approximate System Phase Noise Floor vs. R
Port Signal Level
The sensitivity of the phase noise measurement system can be improved by
increasing the signal power at the R input port (Signal Input) of the phase
detector in the test set. The graph shown above illustrates the approximate
noise floor of the Agilent/HP 70420A test set for a range of R input port
signal levels from -15 dBm to +15 dBm. These estimates of sensitivity
assume the signal level at the L port is appropriate for either the microwave
or the RF mixer that is used (+7 dBm or +15 dBm, respectively). The
approximate phase Detector calibration Constant that results from the input
signal level at the R port is shown on the right side of the graph.
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