W9068A Datasheet, PDF (9/16 Pages) Keysight Technologies – Phase Noise X-Series

09 | Keysight | Phase Noise X-Series Measurement Application N9068A & W9068A - Technical Overview
Phase noise subtraction
The X-Series signal analyzers also
feature phase noise subtraction.
Using a source with low phase noise,
you can eliminate the influence of the
signal analyzer’s internal phase noise
on measurement results for close-in
offset frequencies.
Use reference trace subtractions to:
–– Improve measurement accuracy
and sensitivity
–– Make the best trade-off between
cancellation effectiveness and
computation time with user-
selectable thresholds
By using the trace subtraction func-
tion, you can subtract the DANL floor
or phase noise of the X-Series
signal analyzer.
Phase noise measurements
up to 50 GHz and beyond
When the N9068A phase noise mea-
surement application is installed in
the N9030A PXA high-performance
signal analyzer, one-button phase
noise measurements up to 50 GHz
can be made. Furthermore, when
installed in a PXA with external
mixing Option EXM or the millimeter-
wave EXA with Option EXM, and an
external mixer (such as the Keysight
M1970V USB smart mixer), the
N9068A can perform phase noise
measurements covering the carrier
frequency up to 110 GHz or even
higher. The automated DANL mea-
surement is not available for external
mixing (Figure 7).
Figure 8. Phase noise measurement at 67 GHz with PXA Option EXM and
an external mixer