Combination of HP and LP filters for narrow band antialiasing filter

Bohumil Brtník

   The discrete time signal processing requires an anti-aliasing filter at the input and a reconstruction filter at output. Some filters of biquads structure are characterized by a decreasing of the attenuation at high frequencies, caused by the final value of the output resistance of the operational amplifier. In this paper we discuss a design of combined BP filter without mentioned decrease. The proposed filter structure was verified by SPICE simulation.

Keywords: low-pass, band-pass filters structure, real operational amplifier; frequency response, decrease of the attenuation at high frequencies

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