Measurements on multiports and balanced DUTs
Standard measurement mode: virtual differential mode
The R&S®ZVA characterizes balanced DUTs with one or two balanced ports quickly and accurately. The balanced DUT is directly connected to the analyzer test ports. Its unbalanced S-parameters are measured, and the mixed-mode S-parameters are calculated from these values. The numerous traces and diagrams offered by the R&S®ZVA provide full characterization of the DUT and straight forward display of all measurement quantities. No sophisticated settings are required on the part of the user. Convenient marker search and analysis functions facilitate result evaluation especially in the case of filter measurements, for example by determining the filter parameters such as bandwidth, ripple, quality factor, etc.
Display of mixed-mode S-parameters of a SAW filter
True differential measurement mode: analyzing differential amplifiers under real-world conditions
Active components in particular may show a distinctly different response to a stimulus signal, depending on whether the virtual (standard) or the true differential measurement mode is applied.
To obtain reliable results even for active differential DUTs, the R&S®ZVA-K6 option provides true differential stimulation and measurements. The test signals delivered by the two internal generators are applied at the reference plane simultaneously with 180° or 0° phase difference. The measurements on the selected test ports are performed simultaneously.
Switching between both modes with a mouse click
Output signals of two R&S®ZVA ports in true differential mode (measured with an oscilloscope) using stimulus signals with 0° or 180° phase difference
Simultaneous display of S-parameters obtained in virtual and true differential mode
The R&S®ZVA-K6 option also supports true phase imbalance and true amplitude imbalance sweeps of the two stimulus signals.
