Realization of a current-mode all-pass or notch filter using a CFA and a follower

A novel network for realizing a current-mode notch, all-pass, lowpass or highpass filter using a current feedback amplifier (CFA), a current follower (CF) and six/four/two passive elements is presented. The proposed current-mode filters offer high output impedance, so they do not require critical matching conditions. The passive sensitivities of the proposed current-mode filters have been derived. Moreover, the quality factor V and the central frequency ω-o$/ of the proposed filters are insensitive to the voltage and current tracking errors of a CFA and a CF. Finally, five experimental results are included to certify the theoretical prediction.