RC amplifiers for active filters.

This paper presents a new method of realization of second-degree filters having low-pass, band-pass and high-pass characteristics. Each of the characteristics requires two unity gain non-inverting type amplifiers in addition to passive resistances and capacitances. Details of sensitivity analysis have been reported. This method of realization gives appreciably low Q sensitivity due to the variation of passive elements. But the Q sensitivity due to the variation of the gain of the amplifier becomes a little high. This limits its application in high-Q filters.
This paper gives a new realization procedure for active second-order filters. Each of the band-pass, low-pass and high-pass characteristics requires two unity gain non-inverting amplifiers in conjunction with the passive resistances and capacitances. Details of sensitivity analysis show that the percentage variation of pole Q due to the percentage variation of passive R and C is sufficiently low. But the Q sensitivity due to the variation of amplifier gain is a little high. This dictates that the method will be practically useful in the case of low-Q filters. [ABSTRACT FROM AUTHOR]