Microsystem Technologies

, Volume 14, Issue 7, pp 903–907

Design and fabrication of the suspended high-Q spiral inductors with X-beams

Technical Paper

DOI: 10.1007/s00542-007-0551-6

Cite this article as:
Hsieh, M.C., Jair, D.K. & Lin, C.S. Microsyst Technol (2008) 14: 903. doi:10.1007/s00542-007-0551-6


In this paper, deep sub-micron CMOS process compatible high Q on-chip spiral inductors with air gap structure were designed and fabricated. In the design the electromagnetic solver, SONNET, and the finite element program, ANSYS, were used for electrical-characteristics and maximum mechanical strength, respectively. The copper wires were capped with electroless Ni plating to prevent the copper from oxidizing. A Si3N4/SiO2 X-beam was designed to increase the mechanical strength of the inductor in air gap. The enhancement of maximum mechanical strength of a spiral inductor with X-beams is more than 4,500 times. Among these structures, the measured maximum quality factor (Q) of the suspending inductor and frequency at maximum Q are improved from 5.2 and 1.6 GHz of conventional spiral inductor to 7.3 and 2.1 GHz, respectively.

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Electronic EngineeringKun Shan UniversityYung-KangTaiwan, ROC
  2. 2.Department of Mechanical EngineeringKun Shan UniversityTainan HsienTaiwan, ROC
  3. 3.Department of Electronic EngineeringFortune Institute of TechnologyKaoshiungTaiwan