Advertisement
Demonstration 3:
Integrated noise
measurement
Depending upon applications, other
aspects of the phase noise may better
serve the purpose of evaluating your
DUT's phase noise behaviors. In the
digital world, root-mean-square (rms)
phase deviation/jitter (in degrees
or radians) and rms phase jitter (in
seconds) are used more frequently
to evaluate the stability of a high-
frequency clock. On the other hand,
residual FM is more important to
amplifier designers and manufacturers.
The X-Series signal analyzers make
these measurements easy with
advanced marker functions applied
on the measurement result of the
Log plot.
Instructions
On the X-Series Phase Noise mode:
View Log plot
Set the signal analyzer with a carrier
frequency of 1 GHz and an amplitude
reference level of 0 dBm
Set the start offset to 100 Hz and stop
offset to 100 MHz and restart the log plot
measurement
Activate markers for the rms jitter
measurements
Set an integrated band and get the
integrated noise measurement results
Turn on the marker table
Add the residual FM measurement with a
different integrated band being set
Figure 4. Calculate rms jitter and residual FM using band marker functions
5
Keystrokes
[Meas] {Log Plot}
[FREQ Channel] {Carrie Freq} [1] {GHz};
[AMPTD Y Scale] {Ref Value} [0] {dBm}
[SPAN X Scale] {Start Offset} [100]{Hz};
{Stop Offset} [100]{MHz}, then [Restart]
[Marker Function] {RMS Noise} {Jitter}
{Band Adjust} {Band/Interval Left} [1]
{kHz}, {Band/Interval Right} [10] {kHz},
then read the value in bold green font on
the top right corner of the display
[Marker] {More 1 of 2} {Marker Table On}
[Maker Function] {Select Marker}
{Marker 2} {Residual FM}; {Band
Adjust} {Band/Interval Left} [50]{kHz},
{Band/Interval Right} [100] {kHz}, then
read the value in bold green font on the
top right corner of the display
Advertisement
