Plot transfer function with input

Hello there.

I have a transfer function of OP AMP:

And how do I plot step(g) with input Vi(t) = 3V ?I have no idea how to

Thanks.

Answer 1

[Sam Chak]

Hi @Kaizi

Here are two simplest ways to do it:

Method 1:

Vi = 3;     % input
G  = tf([1.8 2.4 0], [0.72 1.8 1])

G =
 
    1.8 s^2 + 2.4 s
  --------------------
  0.72 s^2 + 1.8 s + 1
 
Continuous-time transfer function.

step(Vi*G)

Method 2:

t = linspace(0, 7, 701);    % sim time
u = Vi*ones(1, length(t));  % input
lsim(G, u, t)

[Kaizi]

oke thanks you very much and so how can i simulate it and analyze the response step on simulink?

[Sam Chak]

You are welcome, @Kaizi. If you find the solution helpful, please consider accepting ✔ and voting 👍 on the answer. Thanks a bunch! 🙏

Regarding the Simulink, use the Step Block and (double-click) set the FInal value to the desired value. In your case, set 3.

[Kaizi]

thanks you

[Sam Chak]

Hi @Kaizi, don't forget to accept thw Answer. 🙏