cicCIC Filter Introduction Matthew P. Donadio m.p.donadio@ieee.org 18 July 2000 For Free Publication by Iowegian 1 Introduction As data converters become faster and faster, the application of narrow-band extraction from wideband sources, and narrow-band construction of wideband signals is becoming more important. These functions require two basic signal processing procedures: decimation and interpolation. And while digital hardware is becoming faster, there is still the need for ecient solutions. Techniques found in [CR83] work very well in practice, but large rate changes require very narrow band lters. Large rate changes require fast multipliers and very long lters. This can end up being the largest bottleneck in a DSP system. In [Hog81], an ecient way of perfoming decimation and interpo……