![]() Also, consider that the broad purpose of circuit simulation is to augment basic hand calculations and predict general circuit behavior. ![]() ![]() Computing power was very expensive. The simulation of a circuit to the highest degree of accuracy could have taken longer and cost more money than building the actual circuit to see the results. SPICE simulation was created over 30 years go and around that time a typical computer had less power than the average microwave oven did thirty years later. To understand the tradeoff between speed and accuracy in SPICE simulation one must consider a number of factors. SPICE simulation options generally allow the user to gain more accuracy in the results at the cost of the speed of the simulation. OP * perform a DC operating point analysisĪlthough the SPICE models used in a SPICE simulation can greatly affect the accuracy of the results, simulation settings also contribute to varying degrees of accuracy. * Any text after the asterisk '*' is ignored by SPICE We include both netlist and corresponding circuit schematic. Consider as an example the simple voltage divider circuit below. The netlist is a text description of all circuit elements such as transistors and capacitors, and their corresponding connections. Modern schematic capture and simulation tools such as Multisim allow users to draw circuit schematics in a user-friendly environment, and automatically translate the circuit diagrams into netlists. PSPICE is a commercially available program that uses proprietary languages to define components and models.Ī circuit must be presented to SPICE in the form of a netlist. One of the most common errors made by even seasoned engineers is confusing a SPICE model with a PSPICE model. Using a SPICE model inappropriately can lead to inaccurate results, or even generate an error in some circumstances. It is important to consider this when using the models supplied with a SPICE simulation package. The quality of SPICE models can vary, and not all SPICE models are applicable to every application. Most commercially available simulators include more than 15,000 different components. Using these intrinsic components as the basic building blocks for larger models, designers and chip manufacturers have been able to define a truly vast and diverse number of SPICE models. SPICE has the ability to simulate components ranging from the most basic passive elements such as resistors and capacitors to sophisticated semiconductor devices such as MESFETs and MOSFETs.
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