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Slide 1 © 2001 By Default! Optical Ethernet Design Receiver Group G1 David Gewertz Ryan Baldwin Geoffrey Sizemore Presented : February 14, 2002 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 2 © 2001 By Default! Outline Understanding of previous team progress – removal, redesign, debug Maxim Evalution Kit Redesign transeiver for Gigabit Ethernet Testing and verification – understand chip functionality and future applications – replacement, improvement – BER, compatibility, signal quality A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 3 © 2001 By Default! 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 4 © 2001 By Default! Pitfalls and Resolutions Transmission line noise Power supply interference Different current requirements for multiple components A Free sample background from www.pptbackgrounds.fsnet.co.uk • Avoided right angles in printed circuitry • Length considerations (1/101/4 of a wavelength) • Differential signaling • Load balancing (50-Ohm) • Filtering required to isolate current sources • Multiple power supplies • Decoupling capacitors Slide 5 © 2001 By Default! Final Circuit Diagram (Fall 2001) A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 6 © 2001 By Default! Maxim Evaluation Kits MAX3266 Evaluation Board Diagram Photodiode emulation circuit replaced by photodetector A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 7 © 2001 By Default! Maxim Evaluation Kits Circuit Modifications to Minimize Current Loss – Replacing series resistors and adding a 67-Ohm resistor in parallel A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 8 © 2001 By Default! MAX3266 Board Functionality Photodiode emulation Transimpedance Amplifier (TIA) on chip – inexpensively mimic the output of a photodetector for chip feature testing – – – – 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 9 © 2001 By Default! Maxim Evaluation Kits MAX3264 Evaluation Board Diagram A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 10 © 2001 By Default! 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 RMS Power Detection – provides 55 dB gain with 1.2 Volt max – low jitter enables higher speeds A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 11 © 2001 By Default! 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 12 © 2001 By Default! 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 13 © 2001 By Default! 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 14 © 2001 By Default! 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 A Free sample background from www.pptbackgrounds.fsnet.co.uk