Active RC realization of a third-order low-pass butterworth characteristic using equal-valued passive elements

Two realizations of a third-order low-pass Butterworth characteristic are discussed. All capacitances and resistances used in these realizations are of equal value. The sensitivities of these realizations are compared with those of the Huelsman and the Dutta Roy and Malik realizations. From the sensitivity point of view, the circuits proposed are better than that of Huelsman and compare favorably with, or are better than, those of Dutta Roy and Malik.