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3. Attenuation filters
If we try to create a filter defined solely by a loss template, without considering its phase-shift behavior, we introduce a considerable simplification. In fact, we'll see that, in this case, we can find a transfer function with minimal phase shift (see the article Linear Electric Circuit Theory
Unfortunately, functions with minimal phase shift are governed by a relationship between amplitude and phase that makes it impossible to specify these two behaviors independently of each other
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Attenuation filters
Filters defined in group propagation time
Bibliography
References
Tools
Transfer function calculation software
Matlab (Math Works Inc.)
Mathematica
Mathcad
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Network analysis software
Various versions of Spice (Simulation Program with Integrated Circuits Emphasis ), and signal processing software.
Active filter synthesis
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