Transcription of AN-649 APPLICATION NOTE - Analog Devices
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AN-649 APPLICATION NOTE - Analog Devices
AN-649 APPLICATION NOTEOne Technology Way Box 9106 Norwood, MA 02062-9106 Tel: 781/329-4700 Fax: 781/326-8703 the Analog Devices Active filter Design ToolBy Hank ZumbahlenTable I. Chebyshev Cutoff Frequency to 3 dB FrequencyINTRODUCTIONThe Analog Devices Active filter Design Tool assists the engineer in designing all-pole active filter design process consists of two steps. In Step 1, the response of the filter is determined, meaning the attenuation and/or phase response of the filter is defined. In Step 2, the topology of the filter how it is built is defined. This APPLICATION note is intended to help in Step 1. Several different standard responses are discussed, and their attenuation, group delay, step response, and impulse response are presented. The filter tool is then employed to design the filter . An example is RESPONSESMany transfer functions may be used to satisfy the atten-uation and/or phase requirements of a particular filter .
–2– AN-649 –3– AN-649 BESSEL FILTER Butterworth filters have fairly good amplitude and transient behavior. The Chebyshev filters improve on the amplitude
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