In radio frequency application field often arise the need of using inductor models whose intrinsic characteristics are forrectly represented on the basis of the various working frequencies. Several publications have tmated modeling of integrated inductors based on a more or I s s resistive substrate. Undoubtedly the must interesting approaches are those based on distributed models of turns synthesized as ladder network. The main disadvantage of these innovative models is their intrinsic complexity and therefore the diRlcnlty to implement them as spice device models to be easily used in drmit simulation twls.Reearcbers have mainly focused their attention on the modeling of inductors based on dassie CMOS substrate but there is no work on distributed inductor model made on substrate with little resistive buried layer. At present, tffhnologies tbat deal with such proNes are integrated in Sl'Mic~uelectronics for analog and digital designs. In this paper, OUT aim is, fitly, to describe an innovative distributed inductor model integrated on substrate with buried layer and, secondly, to show an innovative automatic methodology which sllows synthesizing, throngh an optimization procedure, an usable spice model based on the new model described above.

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