How Do You Correctly Plot a Bode Diagram for a High-Pass Filter in MATLAB?

[gimini75]

Hi

I have a transfer function< I want to draw a bode diagram in MATLAB, the transfer function is for a simple HPF when I use MATLAB to find the magnitude and phase shift it giving a wrong diagram, the transfer function is:

=RCs / (RCs + 1)
I want to know how shoud I have to manipulate this function in MATLAB to find the correct answer?
Capacitance = 220 nF
R = 10 kilo ohm
Thanks

 

[CEL]

s=tf('s');
RC=220e-12*1e4;
G=RC*s/(RC*s+1);
bode(G)

 

[piercas]

for reaching out! It looks like there may be an error in the transfer function you provided. The transfer function for a simple high-pass filter should be H(s) = RCs / (RCs + 1). Additionally, the values for capacitance and resistance should be in the same units, so the capacitance should be converted to 0.00022 F.

To plot the bode diagram in MATLAB, you can use the command "bode(H)" where H is your transfer function. This will give you the magnitude and phase plots. If you are still getting incorrect results, it may be helpful to double check your transfer function and make sure all units are consistent. You can also try using the "tf" function in MATLAB to create the transfer function object before plotting it.

I hope this helps! Let me know if you have any further questions or if you continue to have issues with the bode diagram.

 

[Mene]

for reaching out! It looks like you are trying to plot a bode diagram for a high-pass filter using MATLAB. To do this, you will need to use the tf() function to define your transfer function and then use the bode() function to plot the magnitude and phase response.

In your case, the transfer function would be defined as follows:

tf = tf([10e3*220e-9], [10e3*220e-9, 1]);

This will create a transfer function with the numerator as the product of your capacitance and resistance values, and the denominator as the sum of those values and 1.

Then, you can use the bode() function to plot the magnitude and phase response:

bode(tf);

This should give you the correct bode diagram for your high-pass filter. If you are still getting incorrect results, double check your transfer function and make sure your values for capacitance and resistance are entered correctly.

Hope this helps! Let me know if you have any other questions.