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I am trying to design a multi-feedback differential band-pass filter.

While doing calculations I just took Texas Instr. design guides, but nowhere is mentioned exactly how to realize the filter for the required specifications.

Example: I need a pass band ripple of <0.5 dB and pass band 300 Hz to 6 kHz. Attenuation roll-off rate required is 40 dB/decade on either side.

I did a simulation and tried to tune with trial-and-error values. I am getting peak overshoots near cut-off points.

How to realise the filter with a flat pass band?

Please share reference design calculations if available.

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ocrdu
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Narendra Allu
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1 Answers1

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Use a 2nd-order Butterworth Sallen-Key highpass filter in series with a 2nd-order Butterworth Sallen-Key lowpass filter.

Audioguru
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  • Yes - I agree with Audioguru because for such a large bandwidth it would be not a good idea to use the lowpass-bandpass transformation for designing a 4th-order bandpass (two 2nd-order bandpass stages in series). – LvW Mar 12 '22 at 09:27