Innovative 8-shaped inductors integrated in an advanced BiCMOS technology

Abstract

As integrated inductors are a key component for RF circuits, these devices are mainly highlighted because of an imposing size and disturbing radiations. This article focuses on two innovative 8-shaped inductors presenting size reduction and low radiation capability. 8-shaped devices are compared to octagonal inductors by the way of measurements and simulations. 8-shaped inductors, even if presenting slightly lower electrical performances (lower size but lower quality factor), show interesting coupling reduction, with improvements from 7 to 20 dB depending of inductor design and orientation. Future works will consist of optimizing 2/3-turn 8-shaped layouts and test designs in circuit applications.Index Terms -8-shaped inductor, 2x8-shaped inductor, BiCMOS technology, electro-magnetic coupling, inductive cross talk, integrated passives.