Traditionally, pulsed power systems have been designed and operated by the synchronized trigger technology of switch, which guaranteed the output waveform a fast front, high voltage or current. Recently, in order to produce the output current in demand, Genetic algorithm (GA) has been introduced for the pulse shaping by optimizing the operation time of each switch and the charge voltage of each capacity 1 . To investigate technical problems that would happen in full scale drivers, the characterization and modeling of a scaled down programmable current adder was studied in this paper, including how to build the circuit simulation model and associate it with the GA.