Why do I need EMX? EMX is an advanced EM simulator that is very fast and accurate.This interface is supported by Integrand and is documented in the EMX_Calibre_tutorial manual from Integrand. Integrand provides a methodology for integrating Calibre ® and EMX extraction results into a single post-layout netlist for simulation. Integrand’s EMX ® tool is embedded within the Cadence Virtuoso ® environment.