Cadence Design System's version of the popular circuit simulator, SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose, open source analogue electronic circuit simulator. It is a powerful program that is used in integrated circuit and board-level design to check the integrity of circuit designs and to predict circuit behaviour. Simulating the circuit with SPICE is the industry-standard way to verify circuit operation at the transistor level before committing to manufacturing an integrated circuit.