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Optimum design and implementation of IIR SC filters using small-order FIR cells

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2 Author(s)
J. S. Pereira ; Program of Electr. Eng., Fed. Univ. of Rio de Janeiro, Brazil ; A. Petraglia

A novel approach for designing infinite impulse response (IIR) switched-capacitor filters, based on the optimum allocation of poles and zeros of a transfer function, implemented by a direct-form topology using finite-impulse response (FIR) cells as basic building blocks is presented. As a consequence, low sensitivity with respect to capacitance ratio errors in both passband and stopband frequencies, low power consumption, and improved group delay response are achieved. Comparisons with classical IIR and linear-phase FIR filter designs are made. An illustrative design example including simulation and experimental results obtained with a prototype filter are provided.

Published in:

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:49 ,  Issue: 8 )