Digital filter structures having low errors and simple hardware implementation
AHMAD I. ABU-EL-HAIJA, Kishan Shenoi, A. M. Peterson · IEEE Transactions on Circuits and Systems · 1978
Sensitivity and roundoff errors can seriously limit the application of recursive digital filters in practice, particularly when the filters have poles nearz = + 1. A filter structure, based on digital incremental computers is proposed, which has low sensitivity, good error characteristics, and simple hardware implementation for pole locations close toz = + 1. Expressions for the roundoff errors are derived and compared to those for conventional structures. A design procedure is suggested to implement the new filter structure given the transfer function. Simulation results are presented.