Simulink comes with a module called "Analog Filter Design", which can be used to design analog filters. This module is based on MATLAB's filterDesigner tool, which provides some filter types (such as Butterworth, Chebyshev, Elliptic, Bessel, etc.), and allows users to set various parameters of the filter (such as sampling rate, cutoff frequency, order, etc.), and then Automatically generate transfer function models for filters.
The specific operation steps are as follows:
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Add the "Analog Filter Design" block to the Simulink model, which can be found in "Simscape"-"Foundation Library"-"Analog Blocks" in the Simulink library.
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Double-click to open the module, select the desired filter type in "Design Method" (such as Butterworth, Chebyshev, Elliptic, Bessel, etc.), set the order of the filter in "Filter Order", and other related parameters (such as sampling rate, cutoff frequency, etc.).
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Click the "View Filter Response" button to view the frequency response curve and pole/zero distribution of the filter. If you need to adjust the parameters, you can reset the relevant parameters, and then click the button again to view.
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Click the "Export Filter" button to export the automatically generated filter transfer function model to the Simulink model. The model can be used directly for operations such as simulation, analysis or control.
It should be noted that the "Analog Filter Design" module can only be used to design analog filters. If you need to design a digital filter, you need to use the "Digital Filter Designer" module in Simulink or the "Filter Designer" tool in MATLAB.