Concepts and features
R&S
®
ZNB/ZNBT
280
User Manual 1173.9163.02 ─ 62
S
N rows
N columns
S
S
S
S
S
S
S
S
Figure 4-34: S-matrix replication
By default, the firmware simulation applies
InputBufferGroupSimulation.s4p
to
all channels in all setups.
For each setup in the firmware simulation, you have three possibilities to define and
refine the simulated DUT.
1. Load setup-specific simulation data from file.
For the related setup, they take precedence over the default simulation data.
If the number of physical test ports is larger than the "rank" of the S matrix the firm-
ware loads from the specified file (N for
sNp
files), the previously mentioned
2. Load channel-specific simulation data from file.
For the related channel, they take precedence over the data of the setup-specific
and default simulation data.
Again, the previously mentioned replication logic applies.
3. Load port- and channel-specific S-parameter data from file.
For the related ports, they take precedence over channel-specific, setup-specific,
and default simulation data.
To determine S
ij
at a channel frequency, the firmware interpolates between the two
"closest" frequencies of the S-parameter trace ultimately loaded for S
ij
.
4.7.31.2
Simulation noise
The firmware simulation allows you to add noise to the simulated data, i.e. a random
small value added to the simulation data loaded from file. This random value changes
every sweep and every sweep point in time, with the effect of seeing more "realistic"
fluctuating traces, in particular in continuous sweep mode.
Optional extensions and accessories