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Electronics & Photonics (EP)

   

Simulation for System-level Electronic Package (SSLEP) – An Efficient Tool for Power and Signal Integrity (PI/SI) Analysis in Advanced IC Package

Team Members:  Dr. LIU En-Xiao, Dr. WEI Xingchang, Dr. ZHANG Wenzu, and Dr. ZAW Zaw Oo
 
Contact: Dr. LI Er-Ping, Head of Computational Electronics and Photonics
Tel.: +(65) 6419 1111, Email: eplee@ihpc.a-star.edu.sg
 
SSLEP is an efficient simulation tool for the investigation of Power and Signal Integrity on ultilayer printed circuit boards (PCBs) and advanced IC packages. A broad range of methodologies integrated in SSLEP provides to identify issues such as trace and via coupling, power-ground bounce caused by simultaneous switching noise, and placement of local and global decoupling capacitors. Implemented based on equivalent microwave network method, SSLEP can simulate design structures with multilayer power-ground planes, large number of traces and up to thousands of signal and power-ground vias, efficiently in terms of CPU time and memory usage.  

 
 
Printed Circuit Board (PCB) interconnects
 
 
IC packaging interconnects

Background:

The trend of continuously lowering power supply voltage level and increasing signal switching speeds in advanced IC packages and printed circuit boards challenges market-available simulation tools for signal and power integrity (PI/SI) analysis of such complex geometry structures.

 

            A multilayer PCB or IC package can be considered as two functions parts: signal link path and power delivery network. A signal link path consists of traces and vias to set up a communication channel between drivers and receivers; usually pins of integrated circuits (IC), while a power delivery network usually contains a stack-up of power-ground planes, a large number of power-ground vias and many decoupling capacitors to provide an extremely low impedance path from voltage regulator module (VRM) to power-ground pins of IC blocks.

            Advanced Electronics and Electromagnetics (AEE) group @ IHPC has developed a broad range of the different methodologies to model the complex structures of advanced IC packages and PCBs, and integrated into a hybrid algorithm, namely Simulation for System-level Electronic Package (SSLEP), using to investigate the PI/SI of such system. Our group has also developed a user-friendly graphic user interface (GUI) for the algorithm to perform analysis simulations.

 SSLEP Applications:

  • Building up power delivery system guidelines for IC packages and boards

  • Investigating PI and SI in frequency domain in 3D  
  • Evaluating electromagnetic coupling within geometry structures to enable better traces and vias’ layout and decoupling capacitor placement
  • Extracting frequency-dependent S, Y and Z parameters for IC package and board modeling
  • Quantifying decoupling capacitor strategies and verifying placement effects
  • Performing what-if analysis on potential design scenarios and stack-up options
SSLEP Advantages:
  • Easy to set up for analysis of IC packages and boards
  • Quick calculation for via modeling and power-ground plate impedance  
  • No meshing involved and much more efficient, in term of CPU time and memory usage, compared to the full-wave simulation methods available in market
  • Ability to simulate large designs that include thousands of vias and no limit to number of layers (signal, power, ground) in both package and board structures

 Example # 1: 4-ports PCB test board, four layers, two signal vias and three power-ground vias, radii of via & anti-pad (0.25 & 0.5 mm), board dimension (75 x 50 mm), total thickness (4 mm), and substrate material (er: 4.1, tan d: 0.23).

Multilayer PCB with different via interconnects
Figs. 1.1, 1.2 & 1.3: Comparison of simulated results from SSLEP algorithm  and full-wave FEM solver
 
 
 Example # 2: Test PCB board with power and ground planes, total thickness (4 mm), and substrate material is FR-4  (er: 4.7, tan d: 0.2), SMT decoupling capacitor (lumped series {L, C, R} @ {1.57 nH, 8.14 nF, 666 mΩ}).
 Test PCB structure with an SMT decoupling capacitor in different locations
 
 
For location #1, closely spaced decoupling capacitor
 
For location #2, remotely spaced decoupling capacitor
Figs. 2.1 & 2.2: Comparison of simulated results with measured data
 
  Benchmark simulations: design complexity vs. computing resources
 
Memory usage & CPU time vs. number of vias in design structure
 
 
Memory usage & CPU time vs. number of layers in design structure
 
Graphic User Interface (GUI) for SSLEP
User Input Workspace
 
Import 3rd Party Design Layout
Visualized Simulation Results
 
Key Publications in Research Work
  • Y.J. Zhang, Z. Z. Oo, X.C. Wei, E.-X. Liu, J. Fan, and E.-P. Li, "Systematic Microwave Network Analysis for Multilayer Printed Circuit Boards with Vias and Decoupling Capacitors," IEEE Trans. on Electromagnetic Compatibility, will appear in future issue, Mar 2010.
  • Z. Z. Oo, E.-P. Li, X.C. Wei, E.-X. Liu, Y.J. Zhang, and L.-W. Li, "Hybridization of the scattering matrix method and modal decomposition for analysis of signal traces in a power distribution network," IEEE Trans. on Electromagnetic Compatibility, vol. 51, no. 3,pp. 784 - 791, Aug 2009.
  • E.-X. Liu, E.-P. Li, Z. Z. Oo, X.C. Wei, and R. Vahldieck, "Novel methods for modeling of multiple vias in multilayered parallel-plate structures," IEEE Trans. on Microwave Theory & Techniques, vol. 57, no. 7, pp. 1724-1733, Jul 2009.
  • X. C. Wei, E.-P. Li, E.-X. Liu, and R. Vahldieck, "Efficient Simulation of Power Distribution Network by Using Integral Equation and Modal Decoupling Technology," IEEE Trans. on Microwave Theory & Techniques, vol. 56, no. 10, pp. 2277-2285, Oct 2008.
  • X.C. Wei, E.-P. Li, E.-X. Liu, E.-K. Chua, Z. Z. Oo, and R. Vahldieck, "Emission and susceptibility modeling of finite-size power-ground planes using a hybrid integral equation method," IEEE Trans. on Advanced Packaging, vol. 31, no. 3, pp. 536-543, Aug 2008.
  • Z. Z. Oo, E.-X. Liu, E.-P. Li, X.C. Wei, Y.J. Zhang, Mark Tan, L.-W. Li, and R. Vahldieck, "A semi-analytical approach for system-level electrical modeling of electronic packages with large number of vias," IEEE Trans. on Advanced Packaging, vol. 31, no. 2, pp. 267-274, May 2008.
 

 

 

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This page is last updated at: 27-SEP-2012