Electronic Filter Design Handbook, 2nd Edition, Arthur B. Williams
Analog and Digital Filter Design, 2nd Edition, Steve Winder
Active and Passive Analoge Filter Design , Huelsman
Electronic Filter Design Handbook, 2nd Edition, Arthur B. Williams
Analog and Digital Filter Design, 2nd Edition, Steve Winder
Active and Passive Analoge Filter Design , Huelsman
Sadly there isn't "the best book about analogic filters". Any book covering this topic has goodies and bads. But there is a very good free article about that:
**broken link removed**
(Op amps for everyone by Ron Mancini)
see chapter16, Active filter design techniques
Also the pdf could be found on TI website:
**broken link removed**
Wai - Kai "Passive and Active Filters" John Wiley and Sons
Andreas Antonio "Digital Filters, Analysis, Design, and Applications" McGronal awhill International Editions
Frankling F Kou "Network Analysis and Synthesis" John Wiley and Sons
i found them quite informative and quite indepth in their coverage the subject matter