During the last years the term ''Negative Capacitance'' (NC) has appea
red in the literature. Until now there is not a satisfactory theory to
explain NC. However, in this paper we dec-flop a new method to calcul
ate ionic mobility by using a simple quantitative model linked with th
e NC phenomenon. The other aim of this paper is to confirm the validit
y of our previous hypothesis about the origin of NC, and hence to cont
ribute to a better understanding of the NC phenomenon.