R&S ZVB - Page 410

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ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 395
Differences may appear for nonlinear devices at high stimulus power levels. For example, the bias of
semiconductor devices like transistors may depend on the kind of stimulus signal. The following figure
shows a power sweep measured in virtual differential mode (green) and in true differential mode (blue). In
true differential mode, gain peaking is smaller and compression starts at much lower stimulus power.
Remote control:
CALCulate<Ch>:PARameter:SDEFine 'SCD11' |
True Differential Mode on Frequency-Converting DUTs
True differential mode can be combined with frequency-converting measurement modes. A measurement
example is outlined in section Measuring Frequency Converting DUTs in chapter Measurement Examples.
For this type of measurements, a consistent calibration is particularly important. E.g. scalar mixer
measurements are typically performed at different RF and IF frequency ranges.