S-Parameter Formulation of Quality Factor for a Spiral Inductor in Generalized Two-Port Configuration

This paper formulates various quality ( ) factors associated with the applications of on-chip spiral inductors to radiofrequency integrated circuits using -parameters. The formulations start with the factor of a spiral inductor in a generalized two-port configuration based on a new complex-power approach and then extend to the factors of a tank and matching circuits that use the spiral inductors. In the demonstration, the two-port -parameters for a series of CMOS spiral inductors have been measured to further generate such various factors for a manysided evaluation of the inductor performance.