#### naresh850

##### Full Member level 3

In Bilinear transformation s-plane is transformed in z- plane by formulla.

s = (2/T)(1-z^-1)/(1+z^-1); T = Sampling time period

in analog domain

s = d/dt

its in discrete domain

dx/dt = (x-x(n-1))/T where is x(t) is analog signal.T = Sampling time period

so s = (1-z^-1)/T

But in bilinear transform, why 2/(1+z^-1) is added in to define s?

Reagards,

NP