Wide-Band Modeling On-Chip Spiral Inductors Using Frequency-Dependent Conformal ADI-FDTD Method

Hongxing Zheng,Mengjun Wang,Yue Wu,Lu Wang,Kanglong Zhang,Erping Li

doi:10.1109/access.2019.2960284

Abstract

To analyze on-chip spiral inductors efficiently, an alternating direction implicit (ADI) finite difference time-domain (FDTD) method is proposed for general dispersive media. The time-domain recursive-convolution iteration equation can be used to calculate the Debye, cold Plasma, and Lorentz media in the same formula. A locally conformal technique, named medium parameters weighting method is proposed to modeling complex structure accurately. The spiral inductor integrated on the silicon substrate has been analyzed by using conformal ADI-FDTD method. And the simulation results are in agreement with the measured results. These data have been obtained over a wide frequency range from 0.1–20 GHz. The proposed method can easily be used as an accurate computer-aided design tool for radio-frequency integrated circuits.

Highlights

The radio-frequency (RF) integrated circuits are increasing important in modern wireless communications
CODE VERIFICATION OF PROPOSED ALGORITHM To prove the appropriateness of the proposed method in the Section II, the Fortran program is developed based on the frequency-dependent conformal alternating direction implicit (ADI)-finite difference time-domain (FDTD) algorithm
The line source of sinusoidal wave Ez is placed in the center of the FDTD computation region with, 500×500×500 cells and the boundary is truncated by perfectly matched layer [10]

Summary

Introduction

The radio-frequency (RF) integrated circuits are increasing important in modern wireless communications. INDEX TERMS Computer-aided design tools, conformal ADI-FDTD, linearly dispersive media, radiofrequency integrated circuit, spiral inductor. Coefficients c1, c2, d1, d2, d3, αm, βm, and γm (m = 1, 2, and 3) will be succeed by the local effective constitutive parameters when the ADI-FDTD equations are used for a cell with different media.

Results

Conclusion