Electronic Filters

This book provides a comprehensive overview of signal filtering, including an introduction, definitions of the terms and algorithms for numerical calculation of the properties of the transfer function in frequency and time domains. All the chapters discuss the theoretical background and explain the underlying algorithms including the iterative numerical procedures necessary to obtain the solutions.

It starts by considering polynomial filters, offering a broad range of solutions and introducing critical monotonic passband amplitude characteristics (CMAC). It also describes modifications to the classical Chebyshev and elliptic filters to overcome their limitations. In the context linear phase low-pass prototypes, it presents filters approximating constant group delay in the equi-ripple manner for the first time. Further, it discusses new procedures to improve the selectivity of all polynomial filters by introducing transmission zeros, such as filters with multiple transmissionzeros on the omega axis, as well as phase correction of selective filters for both low-pass and band-pass filters. Other topics explored include linear phase all-pass (exhibiting low-pass group delay approximation) filters; all-pass filters (exhibiting band-pass group delay approximation) with linear and parabolic phase synthesized directly as band-pass; high-pass, and band-stop amplitude characteristic frequency transformations to produce band-pass; and direct synthesis of linear and parabolic phase selective band-pass filters synthesized directly as band-pass. Lastly, for system (physical) synthesis, the book describes the algorithms and procedures for the following: cascade passive LC; active cascade RC; active parallel RC (for the first time); active parallel SC; Gm-C based on LC prototypes; and parallel IIR based on bilinear transformation of analog prototypes. Every algorithm, be it in transfer function synthesis or in system synthesis, is accompanied by a proper nontrivialcomprehensive example produced by the RM software.

Covers all topics of filter design related to transfer function (TF) synthesis and hardware synthesis Includes a very wide variety of selective (monotonic and non-monotonic) transfer functions including phase correction Includes "Developers corner" in every chapter, containing advice for both transfer function or hardware designers

Autorentext
Prof. Litovski was born in 1947 in Rakita, South Macedonia, Greece. He graduated from the Faculty of Electronic Engineering in Ni in 1970, and obtained his M.Sc. in 1974, and his Ph.D. in 1977. He was appointed as a teaching assistant at the Faculty of Electronic Engineering in 1970 and became a Full Professor at the same faculty in 1987. He was elected as Visiting Professor (honoris causa) at the University of Southampton in 1999. From 1987 until 1990, he was a consultant to the CEO of Ei, and was Head of the Chair of Electronics at the Faculty of Electronic Engineering in Ni For 12 years. From 2015 to 2017, he was a researcher at the University of Bath. He has taught courses related to analogue electronics, electronic circuit design, and artificial intelligence at the electro-technical faculties in Pritina, Skopje, Sarajevo, Banja Luka, and Novi Sad. He received several awards including from the Faculty of Electronic Engineering (Charter in 1980, Charter in 1985, and a Special Recognition in 1995) and the University of Ni (Plaque 1985). Prof. Litovski has published 6 monographs, over 400 articles in international and national journals and at conferences, 25 textbooks, and more than 40 professional reports and studies.

His research interests include electronic and electrical design and design for sustainability, and he led the design of the first custom commercial digital and research-oriented analogue CMOS circuit in Serbia. He has also headed 8 strategic projects financed by the Serbian and Yugoslav governments and the JNA, and has participated in several European projects funded by the governments of Germany, Austria, UK, and Spain, and the EC as well as the Black See Organization of Economic Cooperation (BSEC).

Inhalt
Introduction.- Basics of signals and filtering.- Transfer function and frequency and time domain responses.- Frequency transformations in the analog domain and applications.- Introduction to the RM software for filter design.- Low-pass selective filters with critical monotonic amplitude characteristic (CMAC) in the passband.- Chebyshev and Modified Chebyshev filters.- Low-pass selective filters with increased selectivity.- Modified Elliptic low-pass filters.- Linear phase low-pass filters with improved selectivity.- Low-pass and band-pass group delay correctors.- Direct bandpass synthesis of linear and parabolic phase all-pass filters.- Direct bandpass synthesis of linear and parabolic phase selective filters.- Passive RLC cascade circuit synthesis.- Active RC cascade circuit synthesis.- Parallel active RC circuit synthesis.- Gm-C filter synthesis based on LC prototypes.- Parallel active SC circuit synthesis.- Parallel synthesis of IIR digital filters based on bilinear transformation ofanalog prototypes.