82 Keysight N5990A MIPI M-PHY Receiver Test User Guide4 CalibrationsCalibration OverviewBefore any test procedure can be run, the MIPI M-PHY test system mustbe calibrated. The calibration plane is given by the DUT input ports. Thereceiver test signal characteristics such as the M-PHY signal generatoroutput voltage level, timing and jitter parameters are typically affected bythe signal transmission between the M-PHY signal generator output portsand the DUT input ports. Transmission elements such as cables, powerdividers, splitters, and TTC (transition time converters) impact the signalgenerator's output signal, for example, by reducing signal levels as a resultof losses and slowing down transition times. Thus, for any signal outputparameter selected by you (set value), the jitter and the signal received atthe DUT input ports (actual value) deviates from the set value. Theadditional deviations can be caused by effects such as offset errors,hysteresis, and non-linear behavior of the M-PHY signal generator.calibration procedures compensate the deviations of the relevant signaloutput parameter actual values from the set values over the requiredparameter range.All calibration procedures required for the MIPI M-PHY receiver testing areincluded in the software. calibration procedures are implemented suchthat the process is conducted as fast as possible and is also automated asmuch as possible, for example, by minimizing the number ofreconfigurations of the hardware connections. Most of the calibrationprocedures are run individually for each clock and data lane, for instance,the LP and HS level calibrations and the inter-pair skew calibration.Calibrations for all hardware configurations are explained in the followingsections.
