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Unconstrained IIR filter design method using argument principle based stability criterion

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2 Author(s)
Aimin Jiang ; Dept. of Electr. & Comput. Eng., Univ. of Windsor, Windsor, ON ; Hon Keung Kwan

In this paper, we propose an unconstrained IIR digital filter design method in the weighted least-squares (WLS) sense. Unlike some other design methods which utilize approximation techniques to simplify the nonlinear approximation error functions, this method expresses the design problem strictly, and utilizes the general-purpose optimization algorithms to find the minimum point. In order to guarantee the stability of designed filters, a stability criterion is developed from the argument principle of complex analysis. Unlike other frequency-domain stability criteria, it is both sufficient and necessary. Two examples are also presented to demonstrate the effectiveness of the proposed method.

Published in:

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Date of Conference:

Nov. 30 2008-Dec. 3 2008