A Lumped-Element Physical Model for Symmetrical Spiral Inductors and their Mutual Cross-Talk in Silicon RF-ICs

Modern RFICs have achieved an impressively high integration level, making crosscoupling effects among different sections of the circuit a potential limit to their functionality. Integrated spiral inductors occupy a significant chip area and are a potential source of EM interference. This paper investigates the coupling effects between two planar spiral inductors. A physical model for the single inductor is introduced, valid for any kind of excitation (singleended, differential and also common-mode). The model is then extended to correctly reproduce the coupling behavior under any kind of excitation.