1 / 41

Challenges in High-Speed Link Chip Design: Bandwidth Limits and Channel Effects

Explore the complexities of designing high-speed link chips, including bandwidth limitations, line attenuation, reflections, and inter-symbol interference. Learn about the impact of various factors on signal quality and the challenges they pose.

gil-cohen
Télécharger la présentation

Challenges in High-Speed Link Chip Design: Bandwidth Limits and Channel Effects

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECE 679 -- Lecture #2 First slides: Prof. Stojanovic, MIT Last slides: Prof. Dally, Stanford

  2. What makes it challenging • Now, the bandwidth limit is in wires High speed link chip > 2 GHz signals

  3. Backplane environment • Line attenuation • Reflections from stubs (vias)

  4. Backplane channel • Loss is variable • Same backplane • Different lengths • Different stubs • Top vs. Bot • Attenuation is large • >30dB @ 3GHz • But is that bad? • Required signal amplitude set by noise

  5. Inter-symbol interference (ISI) • Channel is low pass • Our nice short pulse gets spread out • Dispersion – short latency(skin-effect, dielectric loss) • Reflections – long latency(impedance mismatches – connectors, via stubs, device parasitics, package)

  6. Error! ISI • Middle sample is corrupted by 0.2 trailing ISI (from the previous symbol), and 0.1 leading ISI (from the next symbol) resulting in 0.3 total ISI • As a result middle symbol is detected in error

More Related