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Resistor Model

Type Name: r

The resistor model consists of process-related device data that allow the resistance to be calculated from geometric information and to be corrected for temperature. The parameters available are:

Resistor Model Parameters
name parameter units default example
tc1 first order temperature coeff. $ \Omega$/C 0.0 -
tc2 second order temperature coeff. $ \Omega$/C2 0.0 -
rsh sheet resistance $ \Omega$/$ \Box$ - 50
defw default width M 1e-6 2e-6
narrow narrowing due to side etching M 0.0 1e-7
tnom parameter measurement temperature C 27 50
The sheet resistance is used with the narrowing parameter and l and w from the resistor element line to determine the nominal resistance by the formula
R = rsh . (l - narrow)/(w - narrow).

The parameter defw is used to supply a default value for w if one is not specified on the device line. If either rsh or l is not specified, then the standard default resistance value of 1k is used.

After the nominal resistance is calculated, it is adjusted for temperature by the formula:

R(temp) = R(tnom) . (1 + tc1 . (temp-tnom) + tc2 . (temp-tnom)2)


next up previous contents index
Next: Switch Model Up: Device Models Previous: Capacitor Model   Contents   Index
Stephen R. Whiteley 2006-10-23