Instrument Function
R&S
®
SMJ100A
321
Operating Manual 1403.7458.32 ─ 14
5.8.1.6
Control Signals
The following control signals are processed in the R&S
SMJ:
●
"Burst Gate" for power ramping
●
"Level Attenuation" for power ramping
●
"CW" for controlling the CW (continuous wave) mode
A dedicated internal "Control Data Editor" is provided for defining the control signals.
Refer to
"Control and Marker List Editor"
on page 354 for a description on the provided
settings.
A separate file with the file extension
*.dm_iqc
is created for each defined control sig-
nal and held on the instrument's hard disk.
Continuous Wave Mode
The "CW" signal turns off digital modulation. The signal is output in unmodulated form.
In case of standards in which it is possible to switch between different modulation
modes, the signal is output only and cannot be supplied from an external source. In
such cases it indicates the modulation mode internally (standard GSM: signal high (1)
= modulation mode GMSK and signal low (0) = modulation mode 8PSK EDGE).
The CW control signal is generated internally and fed to the AUX I/O interface. The
control signals for power ramping can be provided externally for Custom Digital Modu-
lation only. When generated internally the signals are output on the AUX I/O interface.
Power Ramping and Level Attenuation
The R&S
SMJ uses the two control signals "Burst Gate" and "Lev_Att" to trigger the
power ramping and level attenuation functions.
The instrument internally generates control signals as configured in
If "Custom Digital Modulation" is used, you can also supply the control signals from an
external source via the AUX I/O interface.
●
Burst gate control signal
The "Burst Gate" signal is a rectangular pulse signal with variable low and high
periods. Signal generation is restricted to the gate high periods. If the power ramp-
ing function is enabled, each transition between two gate periods of the "Burst
Gate" signal triggers the generation of a ramp. Further settings define the form and
the steepness of this ramp, see
"Impact of the Power Ramping Settings on the
●
Level attenuation control signal
The "Lev_Att" signal is a rectangular pulse signal with variable low and high peri-
ods. Level attenuation is applied, if the "Lev_Att" signal is high. If level attenuation
is enabled, the modulation signal level is attenuated by a defined value.
Refer to
on page 358 for a description of the provided settings
for level attenuation and power ramping.
Baseband Signal - Baseband Block
Summary of Contents for SMJ100A
Page 34: ...Preface R S SMJ100A 18 Operating Manual 1403 7458 32 14 Notes on Screenshots...
Page 86: ...Preparing for Use R S SMJ100A 70 Operating Manual 1403 7458 32 14 LXI Configuration...
Page 826: ...Remote Control Commands R S SMJ100A 810 Operating Manual 1403 7458 32 14 UNIT Subsystem...
Page 828: ...Maintenance R S SMJ100A 812 Operating Manual 1403 7458 32 14 Storing and Packing...
Page 844: ...Hardware Interfaces R S SMJ100A 828 Operating Manual 1403 7458 32 14 BERT Connector...
