# Plot transfer function with input

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Kaizi il 5 Apr 2023
Commentato: Sam Chak il 5 Apr 2023
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.
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### Risposte (1)

Sam Chak il 5 Apr 2023
Modificato: Sam Chak il 5 Apr 2023
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)
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Kaizi il 5 Apr 2023
thanks you
Sam Chak il 5 Apr 2023
Hi @Kaizi, don't forget to accept thw Answer. 🙏

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