1 / 14

Optical Ethernet Design

This presentation outlines the progress of the design group in optimizing the optical transceiver for Gigabit Ethernet, including redesign efforts and testing to meet specifications. The use of Maxim Evaluation Kits and circuit modifications are highlighted, along with pitfalls and resolutions encountered. The final circuit diagram and key functionalities of MAX3266 and MAX3264 evaluation boards are discussed, emphasizing the importance of proper testing and verification using BER and Tektronix equipment. The conclusion and next steps towards implementing a receiver module with improved design are also presented.

barryjames
Download Presentation

Optical Ethernet Design

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. Optical Ethernet Design Receiver Group G1 David Gewertz Ryan Baldwin Geoffrey Sizemore Presented : February 14, 2002

  2. Outline • Understanding of previous team progress • removal, redesign, debug • Maxim Evalution Kit • understand chip functionality and future applications • Redesign transeiver for Gigabit Ethernet • replacement, improvement • Testing and verification • BER, compatibility, signal quality

  3. Previous Team’s Progress • Design Team Objectives • Separation of optical transceiver from Intel card • Redesign and fabrication of new board containing optical functionality • Reintegration of board with Intel setup • Verification to meet optical ethernet specifications • Use of evaluation kits in further design efforts

  4. Pitfalls and Resolutions

  5. Final Circuit Diagram (Fall 2001)

  6. Maxim Evaluation Kits • MAX3266 Evaluation Board Diagram Photodiode emulation circuit replaced by photodetector

  7. Maxim Evaluation Kits • Circuit Modifications to Minimize Current Loss • Replacing series resistors and adding a 67-Ohm resistor in parallel

  8. MAX3266 Board Functionality • Photodiode emulation • inexpensively mimic the output of a photodetector for chip feature testing • Transimpedance Amplifier (TIA) on chip • converts current to voltage • converts single-ended input to differential output • 1 mA p-p input = 250 mV p-p output • 10 micro-A p-p input = 2.5 mV p-p output

  9. Maxim Evaluation Kits • MAX3264 Evaluation Board Diagram

  10. MAX3264 Board Functionality • Proper termination impedance and series capacitors to maintain voltage regularity • Buffer on chip • maintains integrity of output from TIA • Limiting Amplifier on chip • provides 55 dB gain with 1.2 Volt max • low jitter enables higher speeds • RMS Power Detection

  11. Testing and Verification • BERT • Tektronix GTS 1250 (1250 Mb/s) • desired BER = 10-12 or 1 error every terabit • Example - For a 4 MB MP3, that would be one bit error for every 31,000 songs transferred • Tektronix CSA 7xxx Scope • accurately measures and records Gb eye diagrams • uses specially designed Communications Signal Analyzer software

  12. Design • Single PCB with both chips • Interface with other design groups (OE, TX) • Interference-free implementation of a single power source to drive all active components

  13. Conclusions • Gb Ethernet technology has been researched and understood • Fall 2001 group projects have been studied for increased understanding and legacy development • Maxim data sheets have been analyzed • Initial research has been completed

  14. Conclusions • Next Steps • Get previous team’s testbed up and functional • Connect and test Maxim boards • Understand development of a receiver module and implement it using our own design

More Related