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Optimized Analog Filter Designs With Flat Responses by Semidefinite Programming

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4 Author(s)
Hoang, N.T. ; Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Melbourne, VIC ; Hoang Duong Tuan ; Nguyen, T.Q. ; Hoang, H.G.

Analog filters constitute indispensable components of analog circuits. Inspired by recent advances in digital filter design, this paper provides a flexible design for analog filters. All-pole filters have maximally flat passband, so our design minimizes their passband distortion. Analogously, maximally flat filters have maximally flat passband, so our design maximizes their stopband attenuation. Its particular cases provide flexible alternatives to the classical counterparts. Semidefinite program (SDP) formulations for the posed filter design problems are presented, which are efficiently solved by existing optimization software. Several examples and comparisons are provided to validate the viability of our design.

Published in:

Signal Processing, IEEE Transactions on  (Volume:57 ,  Issue: 3 )