Rohde & Schwarz SMBV100B - Impact of the Phase Offset

Configuring the Internal Baseband Source
R&S
®
SMBV100B
252User Manual 1178.4460.02 ─ 03
How to observe the effect?
Use the built-in real-time graphical display ("System Configuration > Graphics > Power
Spectrum") and observe the power spectrum of the signal with and without frequency
offset:
●
See Chapter 2.3.5, "Verifying the Generated Signal with the Graphics Display",
on page 61.
●
See "To set and verify a baseband frequency offset" on page 422.
3.10.1.2 Impact of the Phase Offset
The "Phase Offset" determines the phase offset between the different baseband sig-
nals. A phase offset rotates each point of an I/Q constellation diagram by the specified
phase offset.
Figure 3-30: Effect of a Phase Offset of 45 degree angle on the I/Q constellation diagram
How to observe the effect?
Use the built-in real-time graphical display ("System Configuration > Graphics > Con-
stellation") and observe that the points on the I/Q constellation diagram are turning
counterclockwise.
See Chapter 7.1, "Displaying Baseband Signal Characteristics in Real-Time",
on page 407.
3.10.2 Baseband Offsets Settings
Access:
► Select "Baseband > Baseband Offsets" or "BB Input > Baseband Offsets".
The "Baseband Offsets" dialog provides the settings necessary to add frequency
and/or phase offset.
Shifting and Boosting the Baseband Signal