Rohde & Schwarz FSW Series, User Manual

Page: 26 / 371

Measurement Basics
R&S
®
FSW-K7
26 User Manual 1173.9240.02 ─ 17
4 Measurement Basics
Some background knowledge on basic terms and principles used in Analog Demodula-
tion measurements is provided here for a better understanding of the required configu-
ration settings.
● Demodulation Process - Circuit Description ............................................................26
● Demodulation Bandwidth ........................................................................................ 28
● Sample Rate, Measurement Time and Trigger Offset ............................................ 29
● AF Triggers ............................................................................................................. 31
● AF Filters .................................................................................................................32
● Time Domain Zoom .................................................................................................32
● Receiving Data Input and Providing Data Output ................................................... 34
● Analog Demodulation in MSRA/MSRT Operating Mode .........................................48
4.1 Demodulation Process - Circuit Description
The software demodulator runs on the main processor of the analyzer. The demodula-
tion process is shown in
figure 4-1 . All calculations are performed simultaneously with
the same I/Q data set. Magnitude (= amplitude) and phase of the complex I/Q pairs are
determined. The frequency result is obtained from the differential phase.
For details on general I/Q data processing in the R&S FSW, refer to the reference part
of the I/Q Analysis remote control description in the R&S FSW User Manual.
Demodulation Process - Circuit Description