Wire RC Model

If you specify the capacitance for a two terminal resistor, the model is a Wire RC model. If you do not specify the capacitance explicitly, it is computed from the physical length and width of the resistor using Cj and Cjsw. You can use the model parameter cratio to allocate the parasitic capacitance of the wire element between the model’s input capacitor and output capacitor.

If C(inst) is not given and C(model) is given

Otherwise,

The parasitic capacitance assigned to the input and output nodes is given by

If Cj is not given, but thick is given and is nonzero, Cj is calculated as follows:

If di is given and is nonzero,

otherwise

where

εo = 8.8542149e-12 F/meter

εox = 3.453148e-11 F/meter

The value of each capacitor as a function of the temperature is given by

Scaling Effects

For scaling effects, see Scaling Factors (scale and scalem).

The length and width of the Wire RC model are also scaled by the model parameter shrink.

Related Topics

Physical Resistor (phy_res)

Component Statements

Passive Components

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