Electronics > Beginners
Bandpass Filter Design
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Audioguru:
Your second order lowpass filter with the two different frequencies has a very droopy rolloff. It starts cutting well below its -3dB cutoff frequency and gradually increases its slope until it has a 12dB per octave slope  well above its -3dB cutoff frequency.
I show a Butterworth response that has a MUCH sharper rolloff than yours.
LvW:
Rigolon - I just have entered the discussion about bandpass filters, and I must admit that I did not read all the contributions.

I think I am rather familiar with filters (I have published a book in German about filters) and I, therefore, ask you if your problems have been solved at the time being?

If not or if you not quite satisfied with the situation, you should give again a short overview about your requirements (filter specification):
Order of transfer function, center frequency and bandwidth.
If the order is unknown to you, you should specify damping requirements.
Nitrousoxide:

--- Quote from: LvW on May 04, 2018, 05:19:48 pm ---If the order is unknown to you, you should specify damping requirements.

--- End quote ---

Alternatively, you could also specify the filter passband and stopband gain, bandwidth and ripple. (Ripple will be affected by the normalised transfer function coefficients, i.e. Butterworth for maximally flat). A good picture:

Rigolon:
Nitrousoxide - Thx for the tip.

LvW - Sorry for the late response, I live in a small town and when starts to rain it gets impossible to get online. Anyway, my questions so far were all awnsered, but as things go by I come back to ask some more questions  ;D.
For now I will work on what I've learned here and research a bit about zero-phase filters. If there are any bibliography you guys could suggest on this topic I would appreciate it.
LvW:
"zero-phase filters" ...please, can you give some explanation about the meaning of this expression? (Non-inverting bandpass?)
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