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Nonlinear resistor: behavioral model (multi-dim Taylor series)

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Hi,

Does spectre/Cadence support something like an ideal current or voltage multiplier block or anything I could simulate this nonlinear behavior?

I would like to build a behavioral model of the following equation:

i = g1*Vp + g2p*Vp^2 + g3p*Vp^3
- g1*Vm + g2m*Vm^2 + g3m*Vm^3
+ g2vm * Vp * Vm
+ g32pm * Vp^2 * Vm
+ g3p2m * Vp * Vm^2

Without the cross-terms (=1D Taylor series) it is straight forward to implement with pvccs.

The first terms can be implemented by adding the currents.

But, the cross terms are the problem. Thank you!


EDIT: Ok, I think I may have found something: Just pvccs2. Still trying to figure out how to specify the coefficients
 

You can use verilog-a for implementing this function.
 

Yep, that's the one that you should use. Help page is good but in general you just specify the coefficients, it follows a sequence starting from lowest order coefficient to highest, I don't remember the degrees of input voltages for consecutive coefficients though you need to check and make sure.

Alternative is using verilogA (easy) or actually creating that circuit (not so easy).
 

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