ASITIC is CAD tool that aids the RF circuit designer to optimize and model spiral inductors, transformers, capacitors, and substrate coupling. The conductive substrate plays an integral part in determining the quality factor and self-resonance frequency of monolothic passive devices. ASITIC calculations include the electrically induced losses and coupling as well as the magnetically induced eddy current losses. Skin effect and proxmity effects, or eddy currents in the matallization, are also included.
A sample ASITIC current density plot shows current constriction in the inner turns at 5 GHz.