Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 37, Issue 2, Pages 237-244Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/4.982430
Keywords
distributed system; frequency dependence; isolation; spiral inductor
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The frequency dependence of the model parameters of patterned ground shield (PGS) inductors in large part is explained as a consequence of modeling a distributed system with a lumped model. The effects of PGS shape and material on inductor characteristics have been examined and explained. There is an optimum area for a PGS to maximize Q. Using an n(+) buried/n-well PGS, the peak Q is improved by similar to25% from that of an inductor without a PGS while only slightly changing L and C, in comparison to inductors with other PGSs. Having a PGS does not significantly improve isolation between adjacent inductors when isolation is limited by magnetic coupling since a PGS is specifically designed to limit termination of magnetic fields.
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