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Classical IIR Filters, Continuous Time

The Analog Filter Design block designs and applies continuous-time IIR filters with standard band configurations.

All of the analog filter designs let you specify a filter order. The other available parameters depend on the filter type and band configuration, as shown below, where 0 = cutoff frequency, 1 = lower cutoff frequency, 2 = upper cutoff frequency, Rp = passband ripple in decibels, and Rs = stopband ripple in decibels.

Configuration
 Butterworth
 Chebyshev I
 Chebyshev II
 Elliptic
Lowpass
 0
 0, Rp
 0, Rs
 0, Rp, Rs
Highpass
 0
 0, Rp
 0, Rs
 0, Rp, Rs
Bandpass
 1, 2
 1, 2, Rp
 1, 2, Rs
 1, 2, Rp, Rs
Bandstop
 1, 2
 1, 2, Rp
 1, 2, Rs
 1, 2, Rp, Rs

For all of the analog filter designs, frequency parameters are in units of radians per second.

The block uses a state-space filter representation, and applies the filter using the State-Space block in the Simulink Continuous library. All of the design methods use Signal Processing Toolbox functions to design the filter:

For more information on the filter design algorithms, see the Signal Processing Toolbox User's Guide.


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