# Math Help - Converting from the S domain to the Z domain

1. ## Converting from the S domain to the Z domain

I'm having some problems converting this equation in the laplace domain.

$\frac{s}{s^2 + 4}$

I understand that
$z = e^{Ts}$

Can someone please explain the step of convertion.

I'm expecting something with cosines in.

Thanks
Jez

2. Originally Posted by jezzyjez
I'm having some problems converting this equation in the laplace domain.

$\frac{s}{s^2 + 4}$

I understand that
$z = e^{Ts}$

Can someone please explain the step of convertion.

I'm expecting something with cosines in.

Thanks
Jez
I think it would be helpful if you provided more context, like do you have to use the map from the s to z domain you quote, also why you expect to see cosines, ..

CB