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Welcome to the DesignCon 2020 agenda and presentation download site. Here you can view and download conference and/or Chiphead Theater presentations before, during, and after the event. If you’re looking for a presentation from a specific session that you’re unable to find here, it is likely because the presenter has not provided permission for external use or has not yet shared their presentation with us. Please check back after the event for a more complete catalogue of available presentations.

The Impact of Return Loss on Chord Signaling

Sherman Chen  (Principle SI/PI engineer, Kandou Bus)

Location: Ballroom E

Date: Thursday, January 30

Time: 8:00am - 8:45am

Track: 07. Optimizing High-Speed Serial Design, 09. High-Speed Signal Processing, Equalization & Coding

Format: Technical Session

Pass Type: 2-Day Pass, All-Access Pass, Alumni All-Access Pass - Get your pass now!

Vault Recording: TBD

Audience Level: All

In this paper the impacts of Return Loss on the performance of chord signaling (ENRZ) is investigated also compared with NRZ and PAM4. The influences of different patterns of RL is analyzed. The tolerance to the non-uniform RL on each wire of the chord bundle is explored, as well as the tolerance to common mode RL. Two relatively new metrics IMR and IRL, together with a new metrics called Integrated Return Loss Deviation are applied and their respective effectiveness are analyzed and compared. In the end, a set of guidelines for designing optimal chord signaling channel are given.


1. The detailed and comprehensive comparison in terms of the RL impact on ENRZ, NRZ and PAM4.
2. The reasons why low RL w/ resonating behavior kills the eye.
3. The usefulness of IMR, IRL, and RLD.
4. The BKM for designing chord signaling channel.

Presentation Files