and $$\dfrac{V_{\text{out}}(j\omega)}{V_{\text{in}}(j\omega)}=\dfrac{j\omega LR_1R_2}{(j\omega L)((1+j\omega C R_2)(j\omega LR_2+j\omega LR_1+R_1R_2)-j\omega LR_1)}$$

I am having a hard time figuring out how can I translate them into symbolic math or what I will do to them to get their frequency response plots.

  • 3
    \$\begingroup\$ Do you know how to plot some function of a single variable? Symbolic math is not required here. \$\endgroup\$
    – Eugene Sh.
    Commented Oct 5, 2021 at 14:04
  • 1
    \$\begingroup\$ It's been a moment since I used MATLAB but you could define in the terminal or in a script \$s=tf('s');\$ and then you replace 'jw' in your equation with 's'. If you call your transfer function T, then all you need to do is \$bode(T)\$ and it should plot the magnitude and phase responses. \$\endgroup\$
    – Big6
    Commented Oct 5, 2021 at 14:15

1 Answer 1


You can use vectors to represent a transfer function in MATLAB, and then you can use the bode(sys) function to plot the magnitude and phase response

b = 2e9;
a = conv([10 1],[1e5 2e9]);
sys = tf(b,a);

If you want to do it from scratch, you can create a vector of frequencies and plot the function against them.

w = logspace(0,8,200);
sys = 2e9/((10*j*w + 1)*(1e5*j*w + 2e9));
mag = abs(sys);

If you’re new to MATLAB you may need to go to the Mathworks Website to see what some of these functions do.


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