Improvement of Variable Ratio of On-Chip Variable Inductors Using Side Shield

摘要

In this study, we propose a novel structure for a variable inductor to improve the variable ratio. To expand the variable ratio of inductance, a side shield is arranged around a conventional variable inductor. The inductor is evaluated using simulation and measured results. The inductance of the proposed inductor varies from 1.01 to 2.40 nH at 5 GHz. The maximum variable ratio of 2.38 is achieved, which is 13% higher than that of the conventional variable inductor.