>No... Look at the step response. The final value in the step response of a= n FIR filter depends on the number of taps whereas for an IIR filter it dep= ends >on the poles. > >Back to your filter. In addition to settling errors, the IIR quantization = errors can also produce something called 'limit cycles' which are small out= put >oscillations for DC inputs. > >Attached is an IIR C-implementation that handles limit cycles and settling= errors. It supports poles other than 1/2^N. A simple unit-test framework t= ests >a few of the corner cases. > >Scott Thanks, Scott. For pointing me in the right direction. I will study your code carefully. -Andries "The more you learn, the more you realize how little you know..." - attribu= ted to Socrates. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .