Simulating Active Bandpass Filter Example from Textbook in Simulink
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Hello!
I'm an electrical engineering student and is fairly new with MATLAB.
I had tried to simulate a fourth-order butterworth low-pass filter example with the cutoff frequency of 500Hz from a textbook. But the result was not like what I had expected.
Here's my circuit: Vi = 100sin(2*pi*100*t), f = 100Hz
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/484038/image.png)
Here's the plot of Vi and Vo:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/484043/image.png)
What I was hoping, Vi and Vo is sinusoidal.
But, as you can see from the scope, it is clearly not.
My question is, did I set something wrong? Maybe something that had to do with advanced settings and so on.
I'm know that it is better to ask this kind of question at other online electrical engineering forums. But, since that this is an example from textbook, my only idea is there's something wrong with the settings or something similar.
Thank you in advance and I'm very sorry if my English is bad.
2 Comments
Pat Gipper
on 11 Jan 2021
If the circuit was assembled per the picture then it will work as you expect. No advanced settings are required. Double check the values for R & C.
Answers (1)
Priyank Pandey
on 30 Mar 2022
Edited: Priyank Pandey
on 30 Mar 2022
Hi Zuhri,
The above circuit is correct and idealy it should give the desired output of the waveform.
You can refer to the following links to understand the difference between controlled voltage source and
AC voltage source.
Also you can refer to Build a Low-Pass Filter by Using Fixed-Point Data - MATLAB & Simulink (mathworks.com) to learn more about low-pass butterworth filter.
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