Compact Circuit Simulation Model for On-Chip Inductor and Transformer for RF Integrated Circuits

This paper describes modeling of on-chip inductors and transformers for high frequency integrated circuit applications. The effects of the substrate losses, substrate capacitances, overlap capacitances between the turns of spiral and the cross-under layer, and the oxide capacitance between the spiral and the substrate are included in the analysis. Quality factor and scattering matrix forward transmission coefficient are computed based on the proposed model. This model will facilitate on-chip inductor and transformer design and also useful to simulate on-chip inductors and transformers using integrated circuits CAD tools such as SPICE.