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Can anyone help me identify why my data for a bandpass filter does not match the theory curve?

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Lee
Lee on 30 Oct 2016
Closed: MATLAB Answer Bot on 20 Aug 2021
I had my data checked by my professor before we left the lab. It was the expected plot from what he said. It's the phase diagram for my Bandpass filter using 2 capacitors. For reference, this is how it should look. http://www.electronics-tutorials.ws/filter/filter_7.html .
Im not sure why our and/or how our dat is shifted and simple transforms of the data don't seem to work.
  3 Comments
Star Strider
Star Strider on 31 Oct 2016
Without your code and your data it’s difficult to determine what the problem may be (assuming I could do it then). It looks to me that there’s an unaccounted-for series capacitance that is producing a significant phase lead in your data.
That’s the best I can do.

Answers (1)

cool
cool on 16 Dec 2016
how did you get the data of different frequencies? by sweep frequency (eg. 1Hz to 100Hz, 10Hz/s variation)? the filter has some delay, if you variation is too fast, maybe the data you get is not correct. you can do some fix frequecy test, sample data when the output is stable. all the components you use may not precise enough.

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