266 Keysight E8357D/67D & E8663D PSG User’s Guide
Two–Tone Waveform Generator
Creating, Viewing, and Modifying Two–Tone Waveforms
7.
Turn on waveform averaging.
8.
Create a marker and place it on the peak of one of the two tones.
9.
Create a delta marker and place it on the peak of the adjacent
intermodulation product, which should be spaced 10 MHz from the
marked tone.
10.
Measure the power difference between the tone and its distortion
product.
You should now see a display that is similar to the one shown in
Your optimized two–tone signal can now be used to measure the IMD products
generated by a device–under–test.
Note that carrier feedthrough changes with time and temperature. Therefore,
you will need to periodically readjust your I and Q offsets to keep your signal
optimized.
Figure 10-4
To Change the Alignment of a Two–Tone Waveform
This procedure describes how to align a two–tone waveform left or right,
relative to the center carrier frequency. Because the frequency of one of the
tones is the same as the carrier frequency, this alignment eliminates carrier
feedthrough. However, image frequency interference caused by left or right
alignment may cause minor distortion of the two–tone signal. This procedure
builds upon the previous procedure.
1.
On the signal generator, press
Mode Setup
>
Alignment Left Cent Right
to
Left.
2.
Press
Apply Settings
to regenerate the waveform.
Minimized
Delta Marker
Main Marker
Carrier
Feedthrough
