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Implementation of High Input Impedance Multifunction Filter Using FTFNs
N.A. Shah and M.A. Malik

A novel multifunction filter with single input and four outputs employing four four terminal floating nullors (FTFNs) and six passive elements, four of them are grounded is presented. The proposed circuit offers the following advantages: simultaneous realization of lowpass (LP), bandpass (BP), highpass (HP) and Notch filtering functions, no requirement for component matching conditions, the independent control of resonance frequency wo and bandwidth wo/Q, orthogonal control of resonance frequency wo and quality factor Q, use of two grounded capacitors which are ideal for IC implementation, exhibits high input impedance thus facilitating easy cascade connection to realize higher order filters and low passive sensitivity figures. PSPICE simulation results are given to verify the theoretical calculations.

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