The design of arbitrary-band multi-path polyphase IIR filters
Artur Krukowski, İzzet Kale · 2002
The polyphase IIR N-path structure based on the N/sup th/-order all-passes 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.