Cascadable first-order current-mode all-pass filter with electronic tuning

A new cascadable first-order current-mode all-pass filter (FOCMAPF) consists of single active element namely, dual-X current conveyor transconductance amplifier (DXCCTA) and one capacitor is presented in this paper. The proposed filter offers the features of ease of cascading, electronic tuning of pole frequency, low sensitivities to the active components as well as to the passive component, low total harmonic distortion of output current (0.74%) and very good operating frequency (78.4 MHz). HSPICE simulation results using 180 nm CMOS process parameters have been shown to authenticate the proposed theory.