DocumentCode :
842555
Title :
Approximation of arbitrary complex filter responses and their realisation in log domain
Author :
Teplechuk, M.A. ; Sewell, J.I.
Author_Institution :
Glasgow Univ.
Volume :
153
Issue :
6
fYear :
2006
Firstpage :
583
Lastpage :
590
Abstract :
Approximation and design methods of a general class of IIR complex functions without any required symmetrical property are examined. A set of routines has been developed to allow arbitrary amplitude approximation of such asymmetrical functions. Approximation routines will include such features as high-order touch points in both passband and stopband regions, fixed poles and zeros and arbitrary frequency template shaping. These features, in conjunction with a Remez approximation algorithm, will permit the development of functions that realise any reasonable arbitrary shape and form of the transfer function. Approximation routines have been implemented in the XFILTER design software and a number of examples, demonstrating efficiency and flexibility of the proposed approximation method are presented. One fully integrated circuit design of a general complex function is shown. It is realised in the log domain since this technology shows good potential for design of low-power, high frequency and high-dynamic range networks
Keywords :
IIR filters; approximation theory; poles and zeros; transfer functions; IIR filter; Remez approximation; XFILTER software; arbitrary amplitude approximation; asymmetrical functions; filter responses; integrated circuit design; log domain technique; template shaping; transfer function;
fLanguage :
English
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings -
Publisher :
iet
ISSN :
1350-2409
Type :
jour
Filename :
4020216
Link To Document :
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