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Filter quality “Q” and Filter types

Filter quality “Q” and Filter types. “Q” - Quality factor. Consider a band pass filter. “Q” Examples. Q=1, . “Q” Examples. Q=10,. Filter types. Butterworth - Ripple-free passband and a smooth stop band. Butterworth has least distortion due to almost linear phase.

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Filter quality “Q” and Filter types

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  1. Filter quality “Q” and Filter types BAE 5413

  2. “Q” - Quality factor • Consider a band pass filter BAE 5413

  3. “Q” Examples • Q=1, BAE 5413

  4. “Q” Examples • Q=10, BAE 5413

  5. Filter types • Butterworth - Ripple-free passband and a smooth stop band. Butterworth has least distortion due to almost linear phase. • Chebyshev - Predetermined passband ripple and requires smaller order than a Butterworth filter for a desired response. Superior for applications where passband includes only one frequency of interest • Elliptical - Equiripple pass- and stop-band, Predetermined amount of passband ripple along with ripple in the stop band. Elliptic filters require smallest order for a desired magnitude response • Bessel -constant propagation delay across the input frequency spectrum • Gaussian -the most gradual pass band roll-off and the lowest group delay. Low distortion across the spectrum. BAE 5413

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