Low cost active low pass and band pass network

Abstract
An active RC filter circuit is described which realizes second order lowpass and bandpass functions. The filter uses two I.C. Operational amplifiers and four passive components to achieve accurate Q values up to 50. Its Q sensitivity to component values is found to be very low. The results of an exhaustive computer simulation are given which clearly define the operating limits of the circuit. A practical design technique is outlined, and a sixth order example is given.

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