Chapter 4

On The Parasitic Electromagnetic Signals

Christian Gontrand

Abstract

In autonomous, complex circuits, it is more and more necessary to introduce some HV voltage blocks (around 50V: for automotive, photo sensors,). Two technologies are proposed to implement the smart power integrated circuits. The first is the well known planar integration using the deep trench isolation (DTI) technique, and the other one is the new stacked 3D integration using through-silicon vias (TSVs) and re-distribution layers (RDLs). Deep trenches filled with silicon dioxide and polysilicon are suggested to achieve the electrical isolation between the power devices as well as between the power devices and low-voltage CMOS parts. For 3D integration technique, two and three-dimensional TCAD-based simulations of TSV or RDL induced coupling, are investigated on the sensitive regions of the CMOS inverter. Moreover, at very high frequency, it seems necessary to consider the parasitic signal as waves. The studies are done directly in the frequency domain or in the time one: a Finite-Difference Time- Domain method (FDTD) is applied to the analysis of two or three-dimensional interconnect structures. Electric and magnetic field distributions and pulse propagations along vias are presented. The scattering parameters for various cases are calculated and compared. Some key issues of this work are an insight on crosstalk or shielding phenomena between lines just as some electromagnetic behavior of vias. The FDTD technique is also adopted to analyze the entire 3-D structure of interconnect, including the lumped devices.

Total Pages: 142-171 (30)

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