# Bringup Lab Chronicles: A Measurement Two Years in the Making

- Show: [Oxide and Friends](https://hardwarepodcasts.com/podcast/oxide-and-friends)
- Published: 2022-08-23
- Length: 1h 34m
- Episode: 24
- Page: https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making
- Listen: https://share.transistor.fm/s/65a10522

## Summary

Oxide Computer Company electrical engineers Ariane, Eric, and Tom detail the two-year effort to bring up a 100Gb backplane link, utilizing Teledyne LeCroy VNAs and TDRs to measure signal integrity. They explain how a missing 100Ω termination resistor on the clock line caused fatal jitter, a problem solved by adding an external resistor despite datasheet warnings. The team also built a custom probing station and used ANSYS simulations to model vias and impedance, ultimately achieving a link with zero forward error correction.

## Chapters

- [0:00](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=0) Introduction: The 100Gb Backplane Measurement
- [1:43](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=103) TDR vs VNA: Measuring High-Speed Channels
- [5:01](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=301) Insertion Loss, Return Loss, and Impedance Matching
- [23:44](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=1424) ANSYS Simulation: Vias, Stripline, and Fiber Weave Effect
- [50:26](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=3026) The Missing 100Ω Resistor and Jitter Crisis
- [1:00:39](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=3639) Building a Custom Probe Station for PCB Probing
- [1:06:30](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=3990) GLScope Client: Open Source Oscilloscope UI
- [1:18:07](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=4687) Simulation vs. Reality: Surface Roughness and Skin Effect
- [1:31:21](https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making#t=5481) Final Bringup: Zero FEC and System Satisfaction

## Topics

- [PCB design & layout](https://hardwarepodcasts.com/topic/pcb-design)
- [Test & measurement](https://hardwarepodcasts.com/topic/test-and-measurement)
- [Debugging & failure analysis](https://hardwarepodcasts.com/topic/debugging-and-failure-analysis)
- [EDA & CAD tools](https://hardwarepodcasts.com/topic/eda-and-cad-tools)
- [Embedded firmware](https://hardwarepodcasts.com/topic/embedded-firmware)

## Most relevant to

early-stage companies

## Mentioned

- Oxide Computer Company (company)
- Teledyne LeCroy (company)
- ANSYS (company)
- GLScope Client (product)
- Semtech (company)
- Thor Labs (company)
- Misumi (company)

## Related episodes from other shows

- [Talking Signal Integrity & PCB Laminates w/ Bert Simonovich](https://hardwarepodcasts.com/podcast/ontrack/2024-06-04-talking-signal-integrity-pcb-laminates-w-bert-simonovich) (OnTrack)
- [An Interview with Kieran O'Leary](https://hardwarepodcasts.com/podcast/the-amp-hour/2019-07-29-an-interview-with-kieran-oleary) (The Amp Hour)
- [The Latest in PCB Simulation: Expert Insights with Yuriy Shlepnev](https://hardwarepodcasts.com/podcast/ontrack/2024-04-16-the-latest-in-pcb-simulation-expert-insights-with-yuriy-shlepnev) (OnTrack)
- [An Interview with Eric Bogatin - Tilded Thumb Tenets](https://hardwarepodcasts.com/podcast/the-amp-hour/2015-06-04-an-interview-with-eric-bogatin-tilded-thumb-tenets) (The Amp Hour)
- [The Two Person Rule](https://hardwarepodcasts.com/podcast/the-amp-hour/2020-06-01-the-two-person-rule) (The Amp Hour)

## Citing this page

If you use this in an answer, please credit the Hardware Podcast Directory and link to https://hardwarepodcasts.com/podcast/oxide-and-friends/2022-08-23-bringup-lab-chronicles-a-measurement-two-years-in-the-making. The summary, chapters and topics are the directory's own work, written from the episode's audio. The episode itself, its title and its audio belong to Oxide and Friends.