A Closed Form Solution to L 2-Sensitivity Minimization of Second-Order State-Space Digital Filters Subject to L 2-Scaling Constraints

This paper proposes a closed form solution to L2sensitivity minimization of second-order state-space digital filters subject to L2-scaling constraints. The proposed approach reduces the constrained optimization problem to an unconstrained optimization problem by appropriate variable transformation. Furthermore, restricting ourselves to the case of second-order state-space digital filters, we can express the L2-sensitivity by a simple linear combination of exponential functions and formulate the L2-sensitivity minimization problem by a simple polynomial equation. As a result, L2-sensitivity is expressed in closed form, and its minimization subject to L2-scaling constraints is achieved without iterative calculations. key words: state-space digital filters, L2-sensitivity, variable transformation, closed form solution

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