Abstract
A new expert system based analog integrated circuit design tool has been presented. A prototype implementation, OP-1, synthesizes the geometric dimensions for the MOS transistors in an operational amplifier as an initial design. This is achieved through optimization process from SPICE simulation results. It, also, provides the capability to suggest the circuit designer possible actions to be taken in reaching the optimization of circuit performance. Several operational amplifier design cases have been conducted using this expert system with minimum transistor geometry of 3 micrometers.