Specification of a suitable filter characteristic — for example, attenuation, phase shift, size, weight etc.
Selection of an appropriate rational function necessary to realise the specification.
Analysis of the selected circuit (equivalent to the required transfer function) and the calculation of the component values of the chosen filter circuit.
Preliminary computer analysis of the design using SPICE or any CAD (Computer Aided Design) package, followed by
the construction and testing of the chosen circuit.
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