A PC program that generates a model of the parasitics for IC packages

Abstract

The Package Parasitic Model Program is a PC program, that can generate a model of package parasitics for either dual-in-line or for quad flat pack IC packages. The user enters simple dimensional information for the geometries of the package from the package drawings. This information is easy to obtain and some of the more common dimensions can be defaulted if their values are unknown. The program, written in C, then constructs the proposed package layout and calculates each lead's self inductance; its mutual inductance, mutual capacitance and the capacitance to a ground plane if one exists. The whole process of data entry and computer simulation usually takes just a few minutes on a 386 based PC. Results of benchmark package simulations agree to within 10% of hand calculations employing the reference's equations and drawings of the package. The Package Parasitic Model Program is helpful in integrated circuit package design and analysis. It saves the time of tedious data entry required in the more sophisticated three dimensional programs that use large amounts of CPU time on work stations.<>