Frequency Dependent Negative Resistance-A Review

Inductors are bulky and costly but, reducing the size of the inductors reduces the quality factor. There is also a fundamental limitation of using inductor that it cannot be suitable for the micro miniature structure and integrated circuits applications. Because of these limitations, inductors cannot be used in most of the analog circuit applications. Hence simulated inductors are used as an alternative. In case the simulated inductor becomes floating, the simulated circuit for replacement of inductor will be different. In this paper the various floating inductors used in the literature are reviewed and some ideas are proposed which make use of linear transformation for converting floating inductor into grounded inductor. Such transformation results in the formation of a new D element called the Frequency Dependent Negative Resistance (FDNR). Also, this paper presents the basic circuits for simulating the Frequency Dependent Negative Resistance and its applications in analog circuits in the place of floating inductor.

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