5. Production of complex active filters
Complex active filters can be created by combining biquadratic cells or simulating an LC filter.
5.1 Simple cascade of biquadratic cells
For low-order filters (up to 8, for example), with a bandwidth B that's not too small (order of magnitude: B > 20%), synthesis by simple cascading of biquadratic cells is suitable. In this case, the Q coefficients of the cells remain low or moderate (Q < 10 to 15, for example), and sensitivities remain acceptable. The design is very simple, and the independence of the individual cells facilitates adjustment.
Three precautions should be taken in practice:
ensure that the cascading order preserves the filter's dynamic range: high leading Q for weak signals...
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Production of complex active filters
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