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nonlinear capacitor dependent on the node voltage

Question asked by mhpark on Jun 13, 2011
Latest reply on Oct 5, 2011 by jasong

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I am simulating the miller capacitor of n-MOSFET.

However, this capacitor does not have a constant value, but, it has a value that is a function of one of the node voltage that I named.

do you have any idea how to place "2.4*v1^2+1.4v1^-3..." as the value for the capacitor where v1 is a node voltage named?

open for all sorts of discussion.!

thank you

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jasong Oct 5, 2011 5:18 AM
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You can use the symbolically defined device (SDD in the palette Eqn Based-Nonlinear) to define algebraic relationships between currents and voltages. The form of the equation is i=f(v). To define a nonlinear capacitor you would use i=d(q(v))/dt. Use the 'weighting' of 1 in the SDD model to get the d/dt term and multiply by q(v). See the documentation in \doc\modbuild\Custom_Modeling_with_Symbolically-Defined_Devices.html for detail and examples. It takes a little while to get used to the mathematical format of the SDD, but it is very general purpose.
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nonlinear capacitor dependent on the node voltage

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