Rohde & Schwarz FSW Series - 4 Measurement Basics; 4.1 Demodulation Process - Circuit Description

Measurement Basics
R&S
®
FSW-K7
26User 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