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Active Filter Design Techniques

Chapter 16 Active Filter Design TechniquesLiterature Number SLOA088 Excerpted fromOp Amps for EveryoneLiterature Number: SLOD006A16-1 Active Filter Design TechniquesThomas IntroductionWhat is a Filter ?A Filter is a device that passes electric signals at certain frequencies orfrequency ranges while preventing the passage of others. circuits are used in a wide variety of applications. In the field of telecommunication,band-pass filters are used in the audio frequency range (0 kHz to 20 kHz) for modemsand speech processing. High-frequency band-pass filters (several hundred MHz) areused for channel selection in telephone central offices. Data acquisition systems usuallyrequire anti-aliasing low-pass filters as well as low-pass noise filters in their preceding sig-nal conditioning stages. System power supplies often use band-rejection filters to sup-press the 60-Hz line frequency and high frequency addition, there are filters that do not Filter any frequencies of a complex input signal, butjust add a linear phase shift to each frequency component, thus contributing to a constanttime delay.

A filter is a device that passes electric signals at certain frequencies or frequency ranges while preventing the passage of others. — Webster. Filter circuits are used in a wide variety of applications. In the field of telecommunication, band-pass filters are used in the audio frequency range (0 kHz to 20 kHz) for modems and speech processing.

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