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Modeling >> Semiconductor Devices >> VERILOG-A and imaginary numbers and functions
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Message started by T-4444 on Oct 12^th, 2011, 5:32am

Title: VERILOG-A and imaginary numbers and functions
Post by T-4444 on Oct 12^th, 2011, 5:32am

Hi there,

I am working on a compact model for a FinFET transistor in verilog-a, and I have a problem.

I have some equations and functions which deal with imaginary numbers. For instance:

u1v1 = cosh(`M_PI * (xm + i*(toxs_t + Tch/2)) / (2 * toxs_t + Tch));

Now I have to store the real and imaginary part into seperate variables, so I can use them later on. How does this work? In Matlab, for example, you can easily say: a=real(u1v1), and b=imag(u1v1).

Do you have an idea?

Thanks in advance

Title: Re: VERILOG-A and imaginary numbers and functions
Post by Geoffrey_Coram on Oct 12^th, 2011, 10:03am

What do you need complex numbers for? (Verilog-A doesn't provide support for them.)

In one case, people wanted complex numbers to do correlated noise, and the solution was to use a ddt() formulation that gave rise to a 1/jω dependence (which was what was wanted -- not just the "j").

Title: Re: VERILOG-A and imaginary numbers and functions
Post by T-4444 on Oct 18^th, 2011, 11:04pm

I need complex numbers because I am using the conformal mapping technique (which is based on complex functions) in order to calculate the electrostatics of my device, and finally the output current.

Anyway, I will try to do a workaround. When its done, I will post the result.

Thanks for replying.