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In SPICE (Simulation Program with Integrated Circuit Emphasis), a resistor model is used to simulate the behavior of resistors in electronic circuits. While resistors are relatively simple components, their models in SPICE help accurately capture their behavior under various conditions, including DC and AC analyses.

There are different resistor models available in SPICE, with varying levels of complexity and accuracy. One of the commonly used models is the simple linear resistor model, which follows Ohm's law and represents the resistor as a linear relationship between voltage across the resistor.

It's important to note that SPICE resistor models are typically idealized representations of real-world resistors. If you need to model the effects of temperature, manufacturing variations, or other non-ideal behaviors, you may need to use more advanced resistor models or include additional components in your simulation. Additionally, SPICE resistor models assume that the resistors are linear and do not account for non-linear behavior in certain types of resistive materials.