ABSTRACT:The study proposes an optimized design methodology & synthesis for stability of -pole current-mode active-R filter for =20 KHz and Q-factor =1. This paper illustrates a new configuration to realize the stability of -pole current-mode active-R filter. The proposed circuit implements three transfer functions lowpass, bandpass, and highpass concurrently in single circuit with work at different nodes with gratified results. It observed that, all poles of transfer functions have negative real parts, and they are lying within the left-half of the s-plane. The return ratio of Nyquist diagram does not enclose the critical point (-1, 0) for all transfer functions. The gain ( ) and phase ( ) margins are both positive. Thus the closed-loop for all transfer functions of -pole current-mode active-R filter at different nodes are asymptotically stable. This filter is stable for 1Hz ≤ ≥1449 KHz for Q-factor = 1. The output and input gains are identical at gain cross over frequency. The benefits of this filter are the reducing in weight and size, increasing of circuit quality with wide range for frequency, and it is easier and more economical for producing.
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