5.4.3 Types offilters 5 LHH ARY t 0.05 dB passband ripple 15 Eight pole In Butterworth fifi 30 tow pass f -35 40 50 -55 Eight- pole 0.5 d8 Chebyshev low Fass Attenuation 70 Seven pole -78 dB- 580 Cauer elliptic f=165′ f。=1.06 Typical seventh-order 10511523456811523456789 Cauer filte ( Not to scale Fig 5.42 Sharper-cutoff low-pass filters(2)5.4.3 Types of filters Fig. 5.42 Sharper-cutoff low-pass filters(2)