Instrument Function
R&S
®
SMBV100A
333
Operating Manual 1176.8016.02 ─ 17
The "Synchronization State" parameter of the slave instrument displays whether
the synchronization is achieved or not.
Each of the slave instruments calculate and compensate the expected timing delay
caused by the used cables.
5.9.2.5
Control Signals
The following control signals are processed in the R&S
SMBV:
●
"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 365 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 and the signals for power ramping are generated internally.
Power Ramping and Level Attenuation
The R&S
SMBV 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
●
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 369 for a description of the provided settings
for level attenuation and power ramping.
Baseband Signal - Baseband Block
