# Converting from the S domain to the Z domain

• Feb 24th 2011, 06:27 AM
jezzyjez
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
• Feb 24th 2011, 06:34 AM
Ackbeet
• Feb 24th 2011, 10:15 PM
CaptainBlack
Quote:

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