NGSPICE s_xfer Laplace model question

[dillon]

I'm using the s_xfer code model to implement an S-Domain (Laplace) Transfer Function that will ultimately be incorporated into a non-linear dependent current source.

The problem is that the transfer function is not a simple ratio of polynomials in s.

The transfer function is in the form of
1 /  ((abs(s))^x) or 1 / pwr(abs(s),x)

where x is a real, but non-integer value.

I've done this successfully with PSPICE, but don't know if NGSPICE can handle it. Is it possible to implement this with s_xfer? The num_coeff and den_coeff parameters don't really support this.

If this isn't doable with s_xfer, does anyone have any ideas for a workaround?

Thanks,

Dillon