EMC Expert System for Printed Circuit Board
Layout
Researchers at Clemson University are working
with CAD software developers, circuit designers,
and EMC engineers to develop a powerful tool for
modeling and predicting electromagnetic
interference (EMI) problems. EMI/EMC modeling experts are working together
with professional CAE/CAD software developers and
stateoftheart circuit designers representing the
computer, aerospace, and automotive electronics
industries. The goal of this project is to develop
intelligent EMI modeling software that will work
with automated printed circuit board layout tools
to:
 review and analyze printed circuit board
designs;
 point out problems with the layout that
could result in electromagnetic emissions or
electromagnetic susceptibility;
 estimate levels of radiated EMI;
 anticipate ESD and radiated susceptibility
problems; and
 provide circuit and board layout design
advice.
Unlike numerical EM modeling software
or EMC design rule checkers, the software being
developed by this project examines boards in much
the same manner as a professional EMC engineer.
Potential commonmode and differentialmode EMI
sources are identified and evaluated. The software
looks for EMI antennas on or off the board
and evaluates how hard they are being driven. It
identifies any problems found with the board layout
and estimates the impact of these problems on the
radiated EMI from the system.
Two commercial expert system software
tools based on the algorithms developed so far have
already been released.
Quiet Expert from Mentor Graphics and
CR5000 Lightning from Zuken are based on
principles and algorithms resulting from this
project. Both of these tools will continue to get
"smarter" and easier to use as work on this project
progresses.
Web Link
PCB EMC Expert System Web Page
Publications
 T. Hubing, “Performancebased EMC Design using a Maximum Radiated Emissions Calculator,” Journal of Electromagnetic Engineering and Science, vol. 13, no. 4, Dec. 2013, pp. 199207.
 C. Zhu and T. Hubing, “Maximum Radiated Emission Calculator: CommonMode EMI Algorithm,” Clemson Vehicular Electronics Laboratory Technical Report, CVEL13051, Dec. 23, 2013.
 C. Zhu and T. Hubing, “Maximum Radiated Emission Calculator: Power Bus Algorithm,” Clemson Vehicular Electronics Laboratory Technical Report, CVEL13053, Oct. 12, 2013.
 C. Zhu and T. Hubing, “Maximum Radiated Emission Calculator: DifferentialMode EMI Algorithm,” Clemson Vehicular Electronics Laboratory Technical Report, CVEL13052, Oct. 12, 2013.
 T. Hubing, "Designing Automotive Components for Guaranteed Compliance with Electromagnetic Compatibility Requirements," In Compliance Magazine, May 2013.
 X. He and T. Hubing, “A ClosedForm Expression for Estimating the Maximum Radiated Emissions from a Heatsink on a Printed Circuit Board,” IEEE Trans. on Electromagnetic Compatibility, vol. 54, no. 1, Feb. 2012, pp. 205211.
 C. Su and T. Hubing, “Calculating Radiated Emissions due to I/O Line Coupling on Printed Circuit Boards using the Imbalance Difference Method,” IEEE Trans. on Electromagnetic Compatibility, vol. 54, no. 1, Feb. 2012, pp. 212217.
 C. Su and T. Hubing, “Improvements to a Method for Estimating the Maximum Radiated Emissions from PCBs with Cables,” IEEE Trans. on Electromagnetic Compatibility, vol. 53, no. 4, Nov. 2011, pp. 10871091.
 X. He, T. Hubing, H. Ke, N. Kobayashi, K. Morishita and T. Harada, “Calculation of Optimal Ground Post Resistance for Reducing Emissions from ChassisMounted Printed Circuit Boards,” IEEE Trans. on Electromagnetic Compatibility, vol. 53, no. 2, May 2011, pp. 475481.
 C. Su and T. Hubing, “Imbalance Difference Model for CommonMode Radiation from Printed Circuit Boards,” IEEE Trans. on Electromagnetic Compatibility, vol. 53, no. 1, Feb. 2011, pp. 150156.
 X. Dong, H. Weng, D. G. Beetner, T. Hubing, “Approximation of WorstCase Crosstalk at High Frequencies,” IEEE Trans. on Electromagnetic Compatibility, vol. 53, no. 1, Feb. 2011, pp. 202208.
 H. Zeng, H. Ke, G. Burbui and T. Hubing, “Determining the Maximum Allowable Power Bus Voltage to Ensure Compliance with a Given Radiated Emissions Specification,” IEEE Trans. on Electromagnetic Compatibility, vol. 51, no. 3, Aug. 2009, pp. 868872.
 S. Deng, T. Hubing and D. Beetner, “Estimating Maximum Radiated Emissions from Printed Circuit Boards with an Attached Cable,” IEEE Trans. on Electromagnetic Compatibility, vol. 50, no. 1, Feb. 2008, pp. 215218.
 Y. Fu and T. Hubing, “Analysis of Radiated Emissions from a Printed Circuit Board using Expert System Algorithms,” IEEE Trans. on Electromagnetic Compatibility, vol. 49, no. 1, Feb. 2007, pp. 6875.
 H. Shim and T. Hubing, “A ClosedForm Expression for Estimating Radiated Emissions from the Power Planes in a Populated Printed Circuit Board,”IEEE Trans. on Electromagnetic Compatibility, vol. 48, no. 1, Feb. 2006, pp. 7481.
 H. Shim and T. Hubing, “Model for Estimating Radiated Emissions from a Printed Circuit Board with Attached Cables Due to VoltageDriven Sources,” IEEE Trans. on Electromagnetic Compatibility, vol. 47, no. 4, Nov. 2005, pp. 899907.
 H. Shim and T. Hubing, “Derivation of a ClosedForm Approximate Expression for the SelfCapacitance of a Printed Circuit Board Trace,” IEEE Trans. on Electromagnetic Compatibility, vol. 47, no. 4, Nov. 2005, pp. 10041008.
 H. Shim, T. Hubing, T. Van Doren, R. DuBroff, J. Drewniak, D. Pommerenke and R. Kaires, “Expert System Algorithms for Identifying Radiated Emission Problems in Printed Circuit Boards,” Proc. of the 2004 IEEE International Symp. on Electromagnetic Compatibility, Santa Clara, CA, USA, Aug. 2004, pp. 5762.
 M. Xu and T. Hubing, “The Development of a ClosedForm Expression for the Input Impedance of PowerReturn Plane Structures,”IEEE Trans. on Electromagnetic Compatibility, vol. 45, no. 3, Aug. 2003, pp. 478485.
 M. Xu and T. Hubing, “Estimating the Power Bus Impedance of Printed Circuit Boards with Embedded Capacitance,” IEEE Transactions on Advanced Packaging, vol. 25, no. 3, Aug. 2002, pp. 424432.
 M. Li, J. Drewniak, S. Radu, J. Nuebel, T. Hubing, R. DuBroff and T. Van Doren, “An EMI Estimate for ShieldingEnclosure Evaluation,” IEEE Trans. on Electromagnetic Compatibility, vol. 43, no. 3, Aug. 2001, pp. 295304.
 D. M. Hockanson, J. L. Drewniak, T. H. Hubing, T. P. Van Doren, F. Sha, C. W. Lam, and L. Rubin, "Quantifying EMI resulting from finiteimpedance reference planes,"IEEE Trans. on Electromagnetic Compatibility, vol. 39, no. 4, Nov. 1997, pp. 286297.
 N. Kashyap, T. Hubing, J. Drewniak, and T. Van Doren, "An expert system for predicting radiated EMI from PCBs," Proc. of the 1997 IEEE International Symposium on Electromagnetic Compatibility, Austin, TX, Aug. 1997, pp. 444449.
 D. M. Hockanson, J. L. Drewniak, T. H. Hubing, T. P. Van Doren, F. Sha, and M. Wilhelm, "Investigation of Fundamental EMI Source Mechanisms Driving Common‑Mode Radiation from Printed Circuit Boards with Attached Cables," IEEE Trans. on Electromagnetic Compatibility, vol. 38, no. 4, Nov. 1996, pp. 557566.
 T. Hubing, J. Drewniak, T. Van Doren, and N. Kashyap, "An Expert System Approach to EMC Modeling," Proc. of the 1996 IEEE International Symposium on Electromagnetic Compatibility, Santa Clara, CA, Aug. 1996, pp. 200‑203.
