This software is an integration of tools and simulators designed to help the user solve the most common feedforward predistorted amplifier design equations, including calculating gain and loop balance, optimum coupling ratios, and more. It includes the tools needed everyday, such as a microstrip calculator and parallel coupler designer, to relieve the user of lengthy calculations and help predict the performance of a complex amplifier before all the blocks are together. "PACAD" also features a nonlinearity simulator that simulates the intermodulation characteristics of an amplifier given the amplifier"s compression gain and phase curves. This tool helps calculate the required characteristics of an optimum predistortion block, and simulates the combination of predistortion and amplifier in terms of intermodulation products - taking the guesswork out of predistortion block design. There is an accompanying user"s manual in this package.