Advanced Calibration Techniques for VNAs

How Do I Get My Probe De-Embedding Data?• Three techniques to measure S-parameter data of probes…– Easiest: use PNA or ENA macro that performs two one-portcalibrations– Measure a thru and then do an adapter-removal calibration– Measure a thru and then do an unknown thru calibration• Using two one-port calibrations…– Assumes probe is reciprocal (S21 = S12)– First one-port calibration uses coaxial standards– Second one-port calibration uses probe standards– Macro extracts .s2p dataof probe using the twoone-port calibrations1. One- port cal hereusing coaxialstandards.s2pdata2. One-port cal hereusing probestandardsAdvanced VNA Calibration© Agilent Technologies, Inc. 2006 Page M6- 69