I am trying to design a band pass filter that allows frequencies between 16,384Hz and 32,768Hz. Firstly I tried to make it using a passive RC band pass filter:
Using the formula fc = 1/2πRC, the filter should work as I expect, but the result is far from being what I want. This is the result after an AC analysis:
The cutoff frequencies are: 7.1KHz and 71KHz at -9dB, the peak value of the gain is -6dB so I presumed that at -9dB are the cutoff frequencies.
What is even stranger to me is the fact that if I divide the circuit in two filter, a high pass filter (left side of the circuit) and a low pass filter (right side of the circuit), it works perfectly fine, both frequencies under 16KHz and above 32KHz are rejected.
Is there any solution for this circuit or an alternative circuit such a filter with this bandwidth?
Thank you!