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Should the filter frequency response contain magnitude greater than 3dB in magnitude?

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632541
632541 on 22 Sep 2021
Commented: Chunru on 22 Sep 2021
Should the filter frequency response contain magnitude greater than 3dB in magnitude at why axis?
Below is the frequency response of filter. As one can see that the magnitude is in power of 10^-6. IS this design correct?
Is it possible to have low magnitude?
Can one conclude the roll off?
Please clarify my doubts

Accepted Answer

Chunru
Chunru on 22 Sep 2021
if you have 10^-6 dB or lower, then the response is almost flat in amplitude. The design or something else is most likely wrong if you are not design a all-pass filter. To further check the problem, you may want to post the code to produce the plot.
  6 Comments
Chunru
Chunru on 22 Sep 2021
Those parameters can be adjusted. Try it out yourself. Order can be reduced (or estimated). You can try some small values and oberve the transition band around fc. "doc ellip" for more details.
Sure you can use other types of filter. But for a very small value of fc/(fs/2), ellip may result in sharper transition band.

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