CircuiTree - July 2008 - (Page 22) Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy HighSpeed Transmission Lines Brandon Gore, Richard Mellitz, Jeff Loyer, Martyn Gaudion, Jean Burnikell, and Paul Carré A s designers strive to extract ever more performance from high-speed transmission lines on FR-4 substrates and their high-speed derivatives, a requirement has arisen for a practical and robust “Go/No Go” test technique for loss to be deployed on the PCB production floor. The intent of this paper is to propose that root impulse energy (RIE) testing is a practical and achievable test method. It is easily deployed and offers repeatable, reliable discrimination between PCBs fabricated with a range of varying base material loss characteristics. Until recently, digital sigJuly 2008 • circuitree.com nals on PCB transmission lines operated at sub gigabit data rates. Consequently, losses were safely ignored while characteristic impedance was the major transmission factor. Today loss is a major consideration when pushing the limits of transmission lines on PCB boards. A board may be designed to take advantage of the transmission capabilities of a high specification dielectric, but an inadvertent substitution of an inferior specification core or prepreg during the manufacturing cycle, which may easily go unnoticed, could be fatal to the electrical performance of the system. 22 http://circuitree.com
Table of Contents Feed for the Digital Edition of CircuiTree - July 2008 CircuiTree - July 2008 Contents My Line Industry Review Tech Talk Flexible Thinking Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines Intelligent Design 20-Year Retrospective Ask the Flexperts Environmentally Speaking BPA Growth Curves Considering Design Variants to Maximize Process Efficiency Market Outlook Technical Product Spotlights Classified Ads Upcoming Events Ad Index CircuiTree - July 2008 CircuiTree - July 2008 - CircuiTree - July 2008 (Page Cover1) CircuiTree - July 2008 - CircuiTree - July 2008 (Page Cover2) CircuiTree - July 2008 - CircuiTree - July 2008 (Page 1) CircuiTree - July 2008 - Contents (Page 2) CircuiTree - July 2008 - Contents (Page 3) CircuiTree - July 2008 - Contents (Page 4) CircuiTree - July 2008 - Contents (Page 5) CircuiTree - July 2008 - My Line (Page 6) CircuiTree - July 2008 - My Line (Page 7) CircuiTree - July 2008 - Industry Review (Page 8) CircuiTree - July 2008 - Industry Review (Page 9) CircuiTree - July 2008 - Industry Review (Page 10) CircuiTree - July 2008 - Industry Review (Page 11) CircuiTree - July 2008 - Industry Review (Page 12) CircuiTree - July 2008 - Industry Review (Page 13) CircuiTree - July 2008 - Industry Review (Page 14) CircuiTree - July 2008 - Industry Review (Page 15) CircuiTree - July 2008 - Industry Review (Page 16) CircuiTree - July 2008 - Industry Review (Page 17) CircuiTree - July 2008 - Tech Talk (Page 18) CircuiTree - July 2008 - Tech Talk (Page 19) CircuiTree - July 2008 - Flexible Thinking (Page 20) CircuiTree - July 2008 - Flexible Thinking (Page 21) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 22) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 23) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 24) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 25) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 26) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 27) CircuiTree - July 2008 - Toward a PCB Production Floor Metric for Go/No Go Testing of Lossy High-Speed Transmission Lines (Page 28) CircuiTree - July 2008 - Intelligent Design (Page 29) CircuiTree - July 2008 - 20-Year Retrospective (Page 30) CircuiTree - July 2008 - 20-Year Retrospective (Page 31) CircuiTree - July 2008 - 20-Year Retrospective (Page 32) CircuiTree - July 2008 - 20-Year Retrospective (Page 33) CircuiTree - July 2008 - Ask the Flexperts (Page 34) CircuiTree - July 2008 - Environmentally Speaking (Page 35) CircuiTree - July 2008 - BPA Growth Curves (Page 36) CircuiTree - July 2008 - BPA Growth Curves (Page 37) CircuiTree - July 2008 - Considering Design Variants to Maximize Process Efficiency (Page 38) CircuiTree - July 2008 - Considering Design Variants to Maximize Process Efficiency (Page 39) CircuiTree - July 2008 - Market Outlook (Page 40) CircuiTree - July 2008 - Market Outlook (Page 41) CircuiTree - July 2008 - Market Outlook (Page 42) CircuiTree - July 2008 - Market Outlook (Page 43) CircuiTree - July 2008 - Technical Product Spotlights (Page 44) CircuiTree - July 2008 - Classified Ads (Page 45) CircuiTree - July 2008 - Classified Ads (Page 46) CircuiTree - July 2008 - Classified Ads (Page 47) CircuiTree - July 2008 - Ad Index (Page 48) CircuiTree - July 2008 - Ad Index (Page Cover3) CircuiTree - July 2008 - Ad Index (Page Cover4)
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