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16
Reference Graphs and Tables
Approximate System 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 N5500A 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.
+15
+5
-5
-15
-140
E5505a_phase_det_sensitivity
27 Feb 04 rev 1
Figure 288 Noise floor for R input port
360
Figure 288
-150
-160
Approximate phase noise floor (dBc/Hz)
f
10kHz
illustrates the approximate noise floor of
-170
-180
Agilent E5505A User's Guide
.6
.35
.2
.11
.06
.035
.02
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