Two novel circuits to realize high input impedance
voltage-mode allpass filter functions each using a single four terminal
floating nullor (FTFN) and four passive components have been presented. The realizibility
condition is simple and temperature invariant being in the form of resistor
ratio. The phase besides being adjustable by the frequency of applied voltage
signal can also be controlled by adjusting the values of passive components
without disturbing the realizibility condition. Simulation results are also
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