Optimization Methods for Computer-Aided Design

This paper surveys recerd Utility options can save computer and user time. For example, storing a portion of the circuit that is used several times can effect such savings. Another is an editing routine which allows the user to change a portion of the circuit without going tlu-ough the whole list of elements. Though mathematical formulas exist for many different circuit elements and thus, can be incorporated directly in the program, one is likely to meet situations where the element characteristics are not so formulated. Therefore, it is well to have the capability to enter tabular characteristics. Mistakes and errors during the program usage seem unavoidable. The program should plan for them, for instance by checking the reasonableness of the input values or by reading alphabetic identifiers built into the data input. Recovery and/or escape procedures should be provided for the user after the mistake has been made. Accurate and adequate documentation of a program cannot be overemphasized. Without good documentation the effort and money invested to create the program may be wasted. Methods for Computer-Aided Design JOHN W. BANDLER, MEMBER, IEEE