Electronic circuit simulation utilizes mathematical moels to replicate the behavior of an actual electronic device or circuit. Simulating a circuit’s behavior before actually building it greatly improves efficiency and provides insights into the behavior of electronics circuit designs. In particular, for integrated circuits, the tooling (photomasks) is expensive, breadboards are impractical, and probing the behavior of internal signals is extremely difficult. Therefore almost all IC design relies heavily on simulation. The most well known analog simulator is SPICE. Probably the best known digital simulators are those based on Verilog and VHDL.