Digital Signal Processing Reference
In-Depth Information
Inv. Chebyshev 4th-Order Normal. Lowpass
Selectivity: Lowpass
Approximation: Inv. Chebyshev
Implementation: Analog
Passband gain (dB): -1.0
Stopband gain (dB): -33.0
Passband freq (Hz): 0.1591549431
Stopband freq (Hz): 0.3183098862
Filter Length/Order: 04
Overall Filter Gain: 2.23872113857E-02
Numerator Coefficients
QD [S^2 + S + 1 ]
== =========================================
01 1.0 0.00000000000E+00 4.68629150102E+00
02 1.0 0.00000000000E+00 2.73137084990E+01
Denominator Coefficients
QD [S^2 + S + 1 ]
== =========================================
01 1.0 7.67095479088E-01 1.45835864853E+00
02 1.0 2.49520593780E+00 1.96492341597E+00
Figure 2.18
Inverse Chebyshev normalized fourth-order coefficients.
The magnitude and phase responses for the two inverse Chebyshev examples
are presented in Figures 2.19 and 2.20. The same procedure was used as in the
Butterworth and Chebyshev cases.
Figure 2.19
Inverse Chebyshev third-order and fourth-order magnitude
responses.
