Consistent Parameter Extraction for Advanced RF Devices

Calibrating the VNA is an essential step that must be completed before doing any S-parameter measurements. The goal of the calibration is to define systematic measurement errors that will be further excluded from the DUT measurement results by the error correction procedure. In other words, the calibrated system has a virtual measurement reference plane located close to the DUT (at the probe tip end) and has an accurately-defined reference impedance ZREF.