This sheet is used to design planar spiral inductors used on RFICs.
The expressions are from this paper in the IEEE Journal of Solid State Circuits, 10th October 1999, pages 1419-1424.Paper attached.This paper presents several equations, two are caculated here, the
modified Wheeler
and a
Current Sheet Approximation
.These
are calculated for the two common planar inductor types and shown with measured results
The main advantage of this is a starting point for a field solver.