SPICE 11/16

The spice circuit simulator creates circuits based on netlists and then will simulate all properties of that circuit. These properties can then be displayed in a graph and or measured using a measure statement. Spice will also let you make sub circuits for any part you want to make out of transistors. The hardest part about spice is remembering all of the parts to the measure statements, to the transistor statements, and any sub circuits. The way the statements are formatted makes it hard to visualize the circuit which makes it hard for me to understand what all is going on. Spice is mainly used to figure out propagation delays of a circuit and or rise and fall times of a specific part of a circuit. Spice allows you to measure basically any aspect of the circuit and change the width of transistors while logisim only deals with the logic. Logisim will run inputs through gates and gives you the output but will not let measure aspects of the gates. You use spice when you want to optimize a certain aspect of a gate or part of a circuit by modifying transistors.