Active Bandpass Filter

An active bandpass filter can be wide-band or narrow-band as needed. If the higher -3dB frequency divided by the lower -3dB frequency is greater than 1.5 then a wide-band filter is needed. An effective and easily understood active wide-band filter can consist of merely a low-pass and high-pass filter in series. The high-pass and low-pass filters are share the same design, with resistors and capacitors in the same positions but reversed for each type of filter.

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