1. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 1 Optical Ethernet Design Receiver Group G1 David Gewertz Ryan Baldwin Geoffrey Sizemore Presented : February 14, 2002

2. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 2 Outline Understanding of previous team progress Understanding of previous team progress –removal, redesign, debug Maxim Evalution Kit Maxim Evalution Kit –understand chip functionality and future applications Redesign transeiver for Gigabit Ethernet Redesign transeiver for Gigabit Ethernet –replacement, improvement Testing and verification Testing and verification –BER, compatibility, signal quality

3. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 3 Previous Team’s Progress Design Team Objectives 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. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 4 Pitfalls and Resolutions

5. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 5 Final Circuit Diagram (Fall 2001)

6. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 6 Maxim Evaluation Kits MAX3266 Evaluation Board Diagram MAX3266 Evaluation Board Diagram Photodiode emulation circuit replaced by photodetector

7. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 7 Maxim Evaluation Kits Circuit Modifications to Minimize Current Loss Circuit Modifications to Minimize Current Loss –Replacing series resistors and adding a 67-Ohm resistor in parallel

8. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 8 MAX3266 Board Functionality Photodiode emulation Photodiode emulation –inexpensively mimic the output of a photodetector for chip feature testing Transimpedance Amplifier (TIA) on chip 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. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 9 Maxim Evaluation Kits MAX3264 Evaluation Board Diagram MAX3264 Evaluation Board Diagram

10. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 10 MAX3264 Board Functionality Proper termination impedance and series capacitors to maintain voltage regularity Proper termination impedance and series capacitors to maintain voltage regularity Buffer on chip Buffer on chip –maintains integrity of output from TIA Limiting Amplifier on chip Limiting Amplifier on chip –provides 55 dB gain with 1.2 Volt max –low jitter enables higher speeds RMS Power Detection RMS Power Detection

11. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 11 Testing and Verification BERT 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 transferredExample - For a 4 MB MP3, that would be one bit error for every 31,000 songs transferred Tektronix CSA 7xxx Scope Tektronix CSA 7xxx Scope –accurately measures and records Gb eye diagrams –uses specially designed Communications Signal Analyzer software

12. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 12 Design Single PCB with both chips Single PCB with both chips Interface with other design groups (OE, TX) Interface with other design groups (OE, TX) Interference-free implementation of a single power source to drive all active components Interference-free implementation of a single power source to drive all active components

13. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 13 Conclusions Gb Ethernet technology has been researched and understood Gb Ethernet technology has been researched and understood Fall 2001 group projects have been studied for increased understanding and legacy development Fall 2001 group projects have been studied for increased understanding and legacy development Maxim data sheets have been analyzed Maxim data sheets have been analyzed Initial research has been completed Initial research has been completed

14. © 2001 By Default! A Free sample background from www.pptbackgrounds.fsnet.co.uk Slide 14 Conclusions Next Steps 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