This paper presents a method for the overdesign of gain-shaping filters in an optimal way. The passband minima and the stopband maxima of a filter approximation are adjusted using an iterative method, with the objective of obtaining a circuit that satisfies exactly the specifications when the statistical deviation in the filter transfer function due to errors on its components is considered. The result is a filter that can be significantly more selective than what is obtained by a simpler overdesign method that results in an equal-ripple ideal design. Two different approaches are examined, one based in the development of a special approximation followed by synthesis, and the other by direct optimization of an initial classical design.
KeywordsGain Curve Filter Structure Analog Filter Optimal Gain Transmission Zero
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- 1.Orchard, H. J., “Inductorless filters,” Electronics Letters, Vol. 2, pp. 224–225, June 1966. Optimal Gain Overdesign in Analog FiltersGoogle Scholar
- 3.de Queiroz, A. C. M. and Calôba, L. P., “Physically symmetrical and antimetrical ladder filters with finite transmission zeros,” Proc. 30th MWSCAS, Syracuse, USA, pp. 639–643, 1987.Google Scholar
- 4.de Queiroz, A. C. M. and Calôba, L. P., “An approximation algorithm for irregular-ripple filters,” Proc. STB/IEEE International Telecommunications Symposium, Rio de Janeiro, Brazil, pp. 430–433, 1990.Google Scholar