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A lumped active RC circuit synthesis procedure with zero Q-sensitivity to active parameter variations is presented. Proposed circuit structures with active block gains on the order of 35 dB allow one to realize high Q-factors of the transfer function poles. Medium gain values enable the broad-band active block realization and extention of the frequency range of the proposed active filters. An optimal decomposition of third-degree polynomials is given and, based on it, synthesis procedures for three different synthesis models are described. A numerical example is also presented.