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New low roundoff noise realizations of second-order digital filter sections

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3 Author(s)
Tawfik, A. ; Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada ; Agathoklis, P. ; El-Guibaly, F.

New structures for second-order filter sections are proposed that yield lower output roundoff noise than many well known structures and are free of zero-input limit cycle oscillations. These new low-roundoff structures are based on these suggested by Bomar (1989) and are obtained by putting the constraint that some of the state-space coefficients be sum-of-two power-of-two terms. Numerical results are included to illustrate the performance of the proposed structures for narrow-band filters and to compare them with other structures

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Signal Processing, IEEE Transactions on  (Volume:43 ,  Issue: 5 )