GHz 系統中差模對傳輸線的訊號完整度分析
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
DOI
932213E002016
Abstract
In a period of three years, this project will investigate the various signal integrity
(SI) issues caused by differential signaling in multi-layered structures, including the
high frequency reflection by the discontinuity of connectors, the crosstalk due to the
nearby transmission lines, and the ground bounce (also known as delta-I noise) caused
by the drastically varying driver currents during the switching on and off of
high-speed digital circuits in the multi-layered power and grounding environment.
Based on the Finite Difference Time Domain (FDTD) method, this project will
develop a simplified efficient simulation model to predict the voltage drop developed
between the power and ground planes due to the ground bounce. Furthermore, the
model will be extended to take into account several other geometries having larger
concern at higher frequencies. More specifically, for the signal over the slot-cut
isolated power islands, the slot-induced ground bounce will be modeled by simplified
equivalent capacitances and inductances. For the coupling and radiation at the finite
plane boundaries, the field from the opening will be considered by integral equations
and absorbed into the FDTD iteration schemes so as to investigate its influences on
the signal integrity and electromagnetic interference issues. And for the bent-over to
the transmission lines, the equivalent circuits will be constructed by matrix-penciled
moments method. In addition, the placement of the decoupling capacitors to
effectively reduce the ground bounce due to plate resonance will also be discussed.
On the differential signaling for high-speed design, the quasi-static approach will be employed to calculate its propagation characteristics, such as the characteristic
impedance and the crosstalk between two differential pairs. On the discontinuities, the
right-angle bent and the connectors will be considered. The scattering matrices will be
calculated by full wave simulation software and some new design will be exploited to
minimize the reflection and achieve good transition.
This project will build some test structures to do the measurement by time
domain reflectometry (TDR) and time domain transmission (TDT), and network
analyzer in frequency domain. The measured data will be compared with the
simulation results to verify the established analysis model and based on which, to
exploit the signal routing and power distribution system design suitable for next
generation digital electronics with higher switching speed in gigahertz range.
Subjects
Ground bounce
Time domain reflectometry
Signal integrity
Differential Signaling
Finite-difference time-domain method
Publisher
臺北市：國立臺灣大學電信工程學研究所
Type
report
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