Instrument Function
R&S
®
SMU200A
201Operating Manual 1007.9845.32 ─ 15
Fig. 5-8: Transition for a 1 kHz step at 1 GHz with phase continuous mode active. For the graphical
display the signal is down converted into the kHz range.
The available frequency range for phase continuous settings is limited by the fine reso-
lution synthesizer used and varies with the RF frequency setting at the point of activating
the phase continuous mode.
Depending on the instrument equipment - with or without option R&S SMU-B22 - the fine
resolution synthesizer used is a DDS (Direct Digital Synthesizer, with option R&S SMU-
B22) or a Fractional N-Synthesizer (without option R&S SMU-B22). The DDS provides
generally a wider frequency range for phase continuous settings. In addition, two modes
(narrow and wide) allow a selection either in favor of higher signal quality or in favor of
an especially wide frequency range.
When phase continuous frequency setting is active, data sheet values no longer apply
Activating frequency or phase modulation deactivates phase continuous settings and vice
versa.
Setting a Phase Continuous Frequency Sweep
1. In the "RF Frequency Sweep" Menu, if the sweep is active, switch it off.
2. In the "RF Frequency" Menu under the "Phase Continuous Frequency Settings" dia-
log
a) If the "Phase Continuous Frequency Mode" is Active, switch it off
b) Set "Frequency Range" to “Narrow”
c) Select the RF frequency
d) Check displayed Frequency Range
e) If the "Frequency Range" is corresponds with the selected frequency range,
check the Phase Continuous Active box
RF Signal and Analog Modulations - RF Block
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