Title :
The effects of a ground shield on the characteristics and performance of spiral inductors
Author :
Yim, Seong-Mo ; Chen, Tong ; O, K.K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
fDate :
2/1/2002 12:00:00 AM
Abstract :
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 ~25% from that of an inductor without a PGS while only slightly changing L and Cp 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
Keywords :
Q-factor; inductors; lumped parameter networks; microwave integrated circuits; distributed system; ground shield; isolation; lumped model; magnetic coupling; magnetic field termination; model parameters frequency dependence; n+ buried/n-well PGS; optimum area; patterned ground shield inductors; peak Q; radio-frequency integrated circuits; spiral inductors; Coupling circuits; Eddy currents; Frequency dependence; Inductance; Inductors; Magnetic fields; Power dissipation; Shape; Silicon; Spirals;
Journal_Title :
Solid-State Circuits, IEEE Journal of
