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Gigabit Ethernet PMD

Gigabit Ethernet PMD. Opto-Link Inc. – Presentation 5. Vinh Nguyen February 24, 2005. Fixed errors in optical link budget Finished initial schematic design Schematic approved with minor alterations Added details to budget Began looking at board layout. Complete initial board layout

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Gigabit Ethernet PMD

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  1. Gigabit Ethernet PMD Opto-Link Inc. – Presentation 5 Vinh Nguyen February 24, 2005

  2. Fixed errors in optical link budget Finished initial schematic design Schematic approved with minor alterations Added details to budget Began looking at board layout Complete initial board layout Board layout design review Order passives and connectors? Gigabit Ethernet:Progress Summary Completed Tasks Next Week’s Tasks

  3. Gantt Chart

  4. Corrected Optical Link Budget

  5. Transmitter Schematic

  6. Receiver Schematic

  7. Estimated Budget

  8. Board Layout and Transmission Lines • We looked into the possibility of using short 50Ω matched transmission lines to improve performance • Equations for the capacitance per unit length and inductance per unit length of a microstrip transmission line are fairly easy to find • Why bother doing the math when you can use the Internet?

  9. Microstrip Transmission Line Calculator • Microstrip transmission line calculator at: • http://www.emclab.umr.edu/pcbtlc2/microstrip.html • Used 50Ω target impedance and parameters from the ExpressPCB website • A 50Ω transmission line will have a width of 0.10604”-0.11668” (2.69mm-2.96mm)

  10. Problems with Line Size • Transmission lines will be very wide on the boards • Even if we minimize line length, we will still use up a lot of space

  11. Transmission Line Width Comparison

  12. Even Short Transmission Lines Take Up A Lot of Space

  13. Transmission Line Summary • Using transmission lines would probably improve performance • It would be hard to fit the transmission lines on the MiniBoards • Larger boards would result in increased costs

  14. Next Week • Make adjustments to schematic • Complete initial board layout • Board layout design review • Research and order passives? • Refine budget

  15. References • ECE164 Group 2 Presentations. (April 17, 2004). ECE164 Group 2 Website. Retrieved February 24, 2005 from http://www.ee.duke.edu/~mbrooke/EE164.02/Spring_2004/group_2/presentations.html • University of Missouri-Rolla Electromagnetic Compatibility Laboratory. (February 23, 2005). Microstrip. Retrieved February 24, 2005 from http://www.emclab.umr.edu/pcbtlc2/microstrip.html • Various vendor and manufacturer websites

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