CFA-based three input and two outputs voltage-mode universal filter
Nisar Ahmad Shah, M. F. Rather, S. Z. Iqbal · Indian Journal of Pure & Applied Physics · 2005
A new voltage-mode (VM) multifunction filter based on, employing two plus type current feedback amplifiers (CFA) and as many capacitors, and three resistors with three inputs and two outputs, is presented. The proposed configuration synthesize all the generic filtering functions namely lowpass (LP), bandpass (BP), highpass (HP), notch (BS) and allpass (AP) with two functions simultaneously, without requiring the change to be induced in the passive elements and/or rotation of components. The circuit enjoys the features of: orthogonal control of the natural frequency and the quality factor, low impedance outputs suiting cascadibility for higher order transfer functions, and low active and passive sensitivities. The results of computer simulation using PSPICE are discussed.