IEEE Open Journal of the Solid-State Circuits Society (Jan 2024)

8-Shaped Inductors: An Essential Addition to RFIC Designers’ Toolbox

  • Pingda Guan,
  • Haikun Jia,
  • Wei Deng,
  • Teerachot Siriburanon,
  • Robert Bogdan Staszewski,
  • Zhihua Wang,
  • Baoyong Chi

DOI
https://doi.org/10.1109/OJSSCS.2024.3455269
Journal volume & issue
Vol. 4
pp. 131 – 146

Abstract

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The rapidly advancing field of millimeter-wave (mm-wave) radio-frequency integrated circuit (RFIC) design has ushered in an era of remarkable innovation, particularly in the realm of on-chip passive devices. Among them, 8-shaped inductors have emerged as a novel and promising variant, attracting significant research interest thanks to their unique geometry and electromagnetic (EM) properties. The distinctive feature of 8-shaped inductors lies in their antiparallel magnetic fields due to the opposing current flows within the two turns, enabling manifold applications. In this article, we comprehensively explore the 8-shaped inductors with a focus on their diverse utilizations, including EM interference (EMI) reduction, compactness of RF layout, provision for a magnetic feedforward/feedback arrangement, and oscillation mode manipulation, thereby demonstrating that the 8-shaped inductor can be an essential addition to RFIC designers’ toolbox.

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