Elliptic IIR filter sharpening implemented on FPGA

Authors:
V. M. Poučki;A. Žemva;M. D. Lutovac;T. Karčnik
Affiliations:
Laboratory for Integrated Circuit Design, Faculty of Electrical Engineering, University of Ljubljana, Trzaska cesta 25, 1000 Ljubljana, Slovenia;Laboratory for Integrated Circuit Design, Faculty of Electrical Engineering, University of Ljubljana, Trzaska cesta 25, 1000 Ljubljana, Slovenia;Telecommunications Department, School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11120 Belgrade, Serbia;R&D Department, Instrumentation Technologies, Velika pot 22, 5250 Solkan, Slovenia
Venue:
Digital Signal Processing
Year:
2010

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Abstract

Filter sharpening is a technique for designing a higher order filter using several identical low-order filters with the same passband and stopband edge frequencies but with smaller passband ripple and larger stopband attenuation. The technique had been applied to linear phase finite impulse response (FIR) filters only. In this paper the method is applied on the elliptic infinite impulse response (IIR) filters that have nonlinear phase response. By increasing the order of the basic elliptic filter, the transition region can be significantly reduced. The straightforward design procedure is presented. Filters are implemented using the field programmable gate array (FPGA) chips and hardware folding technique.