An approach for the calculation of magnetic field within square spiral inductors at low frequency

The magnetic field distribution within a square spiral inductor is investigated in this paper by summing closed‐form expressions for the fields from each segment. Plots illustrating the variation of the normally directed B‐field penetrating the surface of the spiral traces are then developed for a variety of perspectives. The expressions and insight gained represent an essential step in developing a detailed model of effects such as current crowding, which significantly limit the spiral's performance in practical circuits. Copyright © 2002 John Wiley & Sons, Ltd.