Teledyne-lecroy DFP2 - Digital Filter Package 2 Manuel d'utilisateur télécharger pdf (Page 11)

DFP2 Option

923134 Rev A ISSUED: June 2013 9

IIR Filters

Infinite Impulse Response (IIR) filters are digital filters that emulate analog filters. The four types

offered by the DFP2 option are as follows:

• Butterworth

• Chebyshev

• Inverse Chebyshev

• Bessel

The Butterworth or "maximally flat" filter has the flattest amplitude response of all the available

filters. The Bessel filter is noted for its uniform phase response as a function of frequency. The

following figure shows a comparison between Butterworth and Bessel filters. Note that the Bessel

filter has a wider transition bandwidth, but linear phase within the pass band.

If you need the fastest rollo

ff, the Chebyshev filters have the narrowest transition region for a

given number of stages. However, the Chebyshev filter has ripple in the pass band, while the

Inverse Chebyshev filter exhibits a flat pass band response, but has ripple in the stop band.

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Teledyne-lecroy DFP2 - Digital Filter Package 2 Manuel d'utilisateur Page 11