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Common Mode Filter Design to Reduce Radiation of PCIe 3 / 4 Signal

Scott Lee (Technical Manager, Quanta Computer)

Eriksson Chuang (Quanta Computer inc.)

Justin Wu (Specialist 1, Quanta Computer)

Jerry Syue (specialist 2, Quanta Computer)

Location: Ballroom A

Date: Wednesday, January 30

Time: 8:00am - 8:45am

Track: 12. Electromagnetic Compatibility/Mitigating Interference, 04. System Co-Design: Modeling, Simulation & Measurement Validation

Session Type: Technical Session

Vault Recording: TBD

Audience Level: All

Common mode filter constructed by ground plane voiding had been researched and verified in this paper. EMI test results shown radiation magnitude is reduced at target frequency with designed common mode filter. SSC (Spread Spectrum Clocking) is extensively used for PCIe signal to reduce radiation magnitude. While, SSC will not always be allowed in some PCIe3 configurations. Practicable design of common mode filter is essential to reduce radiation magnitude when system turns off SSC. This paper develops method to design common mode filter in PCB. This method had been verified by EMI test of actual system.


This paper develops and validates common mode filter design methodology to reduce PCIe 3 / 4 signal radiation for system requiring turning off SSC.

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