Packaging Design Concept Simulator for Electronic Circuit

摘要

When designing a printed circuit board, details of the composition of packaging such as the numbers of layers and channels could not be easily determined; therefore, when the design process proceeded to designing a package, trial- and-error processes were often repeated because of the indefinite numbers of layers and channels. Consequently, the design period can be effectively shortened by quantita- tively estimating the configuration of the package when a circuit is designed, because it can prevent the problem that after a circuit is designed, the wiring cannot be accommo- dated in a package and the circuit must be redesigned. The authors established a technology for estimating and evalu- ating the difficulty of a package depending on a channel requirement ratio. In addition, the authors increased the accuracy of estimation by referring to a database that stores the details of successful packages, indexed according to the configuration. However, several types of package configu- rations must be selected. Therefore, an index of the number of disabled channels has been introduced as a disturbance factor to wiring patterns, and the wiring detour ratio and an aspect ratio of board were also taken into account, so that a total length of wiring can be estimated precisely, and an optimum package configuration can be selected with a minimum total length of wiring. Therefore, the authors are convinced that the period for developing a printed circuit board can be shortened, using the technique developed by them.