The design of arbitrary-band multi-path polyphase IIR filters
نویسندگان
چکیده
The polyphase IIR N-path structure based on the N-order allpasses is very attractive for high quality fractional-band filters, as high attenuation and small passband ripples can be achieved for much less coefficients than other filter structures. However its general form suffers from spikes in the stopband independent from the coefficient values. The paper presents alternative ways to those found in literature of designing spike-less filters with minimum compromise to the filter performance and complexity.
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The perfect linear phase requirement can be achieved only by direct design with an FIR filter at the expense of high filter order and hence high computational burden for the given specification. Alternatively, IIR filters can be designed with much smaller orders than their FIR counterparts, but at the expense of the nonlinear phase. However, it is possible to design almost linear-phase IIR filt...
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