What is the meaning of 'smooth factors' in Hspice


In calculating the gate capacitance, hspice model uses

cgd = CF5 * cap * DD+

where DD+ is a so called smooth factor. The user guide mentions that factors such a G- G+ D- and DD+ are smooth factors and that they are not user defined parameters. What is the meaning of this so called smooth factor?

Regards, Alm

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