OrCAD/Allegro one of the best and most professional software simulation and analysis electronic circuits and electronic design automation software division (Electronic Design Automation or abbreviated EDA) is.OrCAD consists of two words that in fact the state of Oregon was the birthplace of early versions of the software and CAD stands for Computer-aided design and computer design means is formed. Cadence SPB OrCAD OrCAD PCB set to Allegro PCB or also known, including various programs to design schematic, simulation and analysis of electronic is circuits.