With the increased complexity of today’s circuits, designers are increasingly dependent on EM simulations during the design phase. With the trend towards smaller circuits and multiple layered circuit boards, EM simulations are needed to accurately model internal circuit interactions. The use of discrete components helps to reduce a circuit’s overall footprint but introduces a level of complexity to the design process when performing co-simulations. A good understanding of the proper EM port configurations and calibration types is required to ensure accurate co-simulation results.