Inductor realisation with a negative-impedance convertor

A circuit consisting of a negative-impedance convertor, suitable for the realisation of an inductor, is presented. For a certain circuit condition the realisation is independent of frequency, and by the variation of a single capacitor the inductance value of the inductor can be varied over a wide range while the resistive part remains constant. Both the inductance and the associated resistive part are shown to be frequency-dependent if this condition is not exactly satisfied.