That equation is next to impossible to read. Are all those "s"'s Laplacian "s" or something else? We have no idea what a term like "g_ds2_g_ds3" means. Maybe you can simplify that and repost it.
You understand that ZEROES are values of s where the transfer function=0, and POLES are where the TF goes to infinity, right?
By using MATHEMATICA Tool i find pole and zeros but it giving very big equations.
Is there any method to find pole zeros from the transfer function. I tried with different methods but am not understanding the results .
Please any one tell the method to find pole zeros .
Is there any method to find pole zeros from the transfer function. I tried with different methods but am not understanding the results .
Please any one tell the method to find pole zeros .
Thanks
Use matlab, You can use h = tf( [num],[den]) to get your transfer function. for eg h = tf( [1] , [1 0]) gives you h = 1 / s.
then use pzplot(h) ..it will give you a plot of your poles and zeros.
---------- Post added at 13:50 ---------- Previous post was at 13:43 ----------
**broken link removed**
See the above link on how to form a Transfer Function using tf ( )
I think you need to simplify your transfer function. No offense, but what you have there is a mess. You've got underscores and capital letters and lowercase letters and spaces and parentheses and brackets. No wonder you can't figure this out. If those things like "g_ds2 g_ds3" are supposed be a single constant, then just use a single letter.
HI barry sorry for inconvenience.
Actually my circuit is like below
By using small signal model i find the equations and after solving iam getting the output impedance. Finally iam getting the numerator and denominator shown as below
........
By using small signal model i find the equations and after solving iam getting the output impedance. Finally iam getting the numerator and denominator shown as below
Num and Den are equivalents to:
Num(s) = a2 s^2 + a1 s + a0
Den(s) = b3 s^3 + b2 s^2 + b1 s + b0
By hand (or by symbolic software) you can easily find a symbolic expression for zeros (Num(s) = 0) because is a 2nd order equation.
But Den(s) is a 3rd grade polynomial --> the symbolic expression of the poles isn't compact as function of b3,b2,b1,b0 , and of course, as function of g_ds1,g_ds2....... is a useless nightmare.
Then, evaluate a0,a1...b0,b1... and continue with Bode plot, poles and zeros, whatever you want.