Alternating stacked inductor for Mega-Hertz power converter and filtering applications

In this paper, an alternating winding structure for the stacked inductor is studied for use in Mega-Hertz switching converter and filtering applications. This alternating stacked winding structure reduces the parasitic capacitance of a stacked inductor. Thus, the operating frequency range of the inductor is substantially extended. The equivalent capacitances of the alternating stacked inductors are estimated by energy consideration in an attempt to explain the relative magnitudes of the capacitances of the stacked inductors with similar but different structures. Both theoretical analysis and practical measurements have confirmed the bandwidth advantages of the alternating stacked inductors.