Calibration and load pull method for RF and baseband frequencies

Calibration procedure of load pull test setup using a pre-calibrated vector network analyzer, wherein;

• the load pull test setup comprises
• a modulated signal source, a device under test (DUT), input and output radio frequency (RF) impedance tuners inserted in a RF path, and low frequency (LF) impedance tuners inserted in a direct current (DC) path, input and output bias tees having RF and DC path, and measurement instruments;
• the calibration procedure comprises
• a) measuring scattering (s-) parameters at RF and LF, of the input and output RF tuners by placing the RF tuning probes at a multitude of positions creating a reflection factor pattern at a frequency Fo covering an area of the Smith chart, and saving;
• b) measuring s-parameters at RF and LF of the input and output LF tuners, inserted in the DC path of the bias tees, by placing the capacitors at a multitude of settings and saving;
• c) measuring s-parameters of the remaining components of the setup at RF and LF and saving;
• d) cascading s-parameters of steps a) to c) and saving.