jbdavid
|
I think the Phillips "rdiff" model is the best one to use for diffusion resistors.. but what you are describing is a "non-linear" resistor, not a "variable" resistor. after all, a Variable resistor will have a control signal, either discrete, or continuous.
V(p,m) <+ I(p,m)*(Rfixed + Rvar*V(cont) + Rpoly*V(cont)*V(cont)); or V(p,m)<+ I(p,m)*transition(Rstep*Rbits,0,tr,tf);
a diffusion resistor is non-linear, with a variation determined by the substrate or well, voltage, but is not "variable" unless you can vary that particular voltage, with respect to the resistor terminal voltage.
|