Abstracr-A class of positive-feedback active RC filters which realize high stable Q's is presented. This class generalizes the earlier circuits of Tarmy and Ghausi and of Moschytz. The performance of the circuits presented is analyzed using a one-pole rolloff model for the operational amplifier. The Q and wO variations due to one-pole rolloff are tabulated for different filters. It is shown that the positive-feedback filters have lower Q sensitivity to the gain-bandwidth product than the state-variable filter. The theoretical behavior of the circuit Q is experimentally verified.
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Srinivasagopalan et al. (1974) studied this question.
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