Digital Demodulation
R&S
®
FPC
158User Manual 1178.4130.02 ─ 07
17 Digital Demodulation
Available with the optional "AM, FM, ASK, FSK Demodulation" application.
The digital demodulation application demodulates signals modulated with amplitude-
shift keying (ASK) and frequency-shift keying (FSK) modulation schemes. It analyzes
these signals and shows various aspects of the modulated and demodulated signal.
You can view the results in various result displays to get an idea about the modulation
accuracy of the signal.
Selecting the digital demodulation measurement application
1. Press the "Mode" key to open the mode menu.
2. Select the "Digital Demod" menu item.
● Measurements and Result Displays......................................................................158
● Measurement Configuration..................................................................................163
● Frequency Configuration.......................................................................................166
● Amplitude Configuration........................................................................................167
● Sweep Configuration.............................................................................................168
● Trigger Configuration............................................................................................ 169
17.1 Measurements and Result Displays
Access: "Meas"
Access: "Setup" > "Config Overview" > "Analysis" (selected settings)
Remote commands required to control measurements and result displays:
●
Chapter 19.15.1, "Measurements and Result Displays", on page 313
The goal of digital demodulation is to determine the quality of the signal that is trans-
mitted by the device under test (DUT) by comparing it against an ideal signal. The DUT
is usually connected with the analyzer via a cable. The key task of the analyzer is to
determine the ideal signal. Hence, the analyzer aims to reconstruct the ideal signal
from the measured signal that is transmitted by the DUT. This ideal signal is commonly
referred to as the reference signal, while the signal from the DUT is called the mea-
surement signal.
After extracting the reference signal, the digital demodulation application compares the
measurement signal and the reference signal, and the results of this comparison are
displayed.
Measurements and Result Displays
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