Rohde & Schwarz SMM100A, User Manual

Page: 194 / 1088

Configuring the internal baseband source
R&S
®
SMM100A
194 User Manual 1179.1341.02 ─ 05
Manual operation: See "Select Ramp to Edit" on page 132
4.7 Generating notched signals
If your instrument is equipped with the R&S SMM-K811, you can apply notched filter.
In the following, the notched filter settings are described based on the ARB functional-
ity. The described settings also apply for:
●
EUTRA/LTE
●
OFDM Signal Generation
4.7.1 Required options
The basic equipment layout for the generation of notched signals includes the following
options:
●
Baseband Generator (R&S SMM-B9)
●
Option Notched Signals (R&S SMM-K811)
Sufficient for the generation of notched signals with the ARB
For the generation of notched signals with one of the digital standards, also the
corresponding option:
–
Option EUTRA/LTE (R&S SMM-K55)
– Option OFDM Signal Generation (R&S SMM-K114)
●
Frequency option (e.g. R&S SMM-B1006)
For more information, see data sheet.
4.7.2 About the notch filters
The noise power ratio (NPR) measurement is a method for evaluating the linearity of
wideband-amplifiers. The NPR measurement use notched filters that are applied on
internally or externally created waveforms.
The R&S SMM100A equipped with the R&S SMM-K811 option allows you to define up
to 25 notches. You can define the frequency offset and bandwidth of each notch indi-
vidually. You can use frequency values with fixed resolution, where the resolution step
depends on the used
Clock Frequency .
The notched filters settings are available for the ARB generator and four digital stand-
ards. The provided settings are identical, merely the access to the settings and the
remote control commands are different.
This section describes the notched filter settings based on the ARB functionality. The
described settings, however, also apply for:
●
EUTRA/LTE
Generating notched signals