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Transmission Line and Termination

Transmission Line and Termination. Transmission Line Analysis. Wavelength Versus Distance Lumped: Distributed: Pulse Transition Versus Propagation Delay Single Mode Frequency response Propagation (timing and phase) delay Loss and dispersion Pulse distortion Multimode Modal analysis

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Transmission Line and Termination

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  1. Transmission Line and Termination

  2. Transmission Line Analysis • Wavelength Versus Distance • Lumped: • Distributed: • Pulse Transition Versus Propagation Delay • Single Mode • Frequency response • Propagation (timing and phase) delay • Loss and dispersion • Pulse distortion • Multimode • Modal analysis • Multi Lines • Crosstalk • Interference

  3. Transmission Lines • Metallic • Parallel Wire Pair • FM and TV antenna • Twisted Wire Pair • Phone line • 10BaseT Ethernet • http://www.swhowto.com/CAT5_Ch1.htm • Coaxial Cable • RG58 • Metallic Conduit • Planar Striplines • Printed circuit board • Hybrid IC carrier • Dielectric • Fiber • Glass • Polymer

  4. Characteristic Impedance • Impedance • Z=V/I for an infinite cable • Coaxial Cable • CATV, lab, microwave instrumentation • Loss • Frequency dependent • Skin depth http://www.ipm.virginia.edu/process/PVD/Pubs/thesis4/chapter2.pdf • TEM mode • Unbalanced

  5. Coaxial Cables http://www.rfcafe.com/references/electrical/coax_chart.htm

  6. Coax Connectors • BNC • Type N • SMA • APC7 • K

  7. Coax Connectors

  8. Twin Lead Cable • Balanced • 300  • Balun • Balanced to unbalance transformer

  9. Twisted Wire Pair • Network Cables • Cat 3, 4, 5, 5E, 6, .. • DSL wiring at home • http://www.smellyeyeball.com/dsl/

  10. Striplines • Micro Stripline • Embedded Stripline • Coplanar Stripline • Loss • Metallic • Skin depth • Localized current flow • Dielectric • Loss tangent • Surface roughness

  11. Transmission Line Termination • Impedance Matching • Termination • Mismatch • Reflection • Time Domain Picture • http://www.williamson-labs.com/xmission.htm • Frequency Domain Analysis

  12. Reflection and Transmission • Reflection • Standing Wave Ratio • Wave Visualization • http://www.educatorscorner.com/index.cgi?CONTENT_ID=2483

  13. Impedance Matching • Effective Impedance • Load impedance • Cable in front of load • Frequency dependent • Bandwidth • Smith chart • http://www.educatorscorner.com/index.cgi?CONTENT_ID=2482 • Impedance Matching • Transformer • www.minicircuits.com/pages/pdfs/tran14-2.pdf • Stub • http://www.ee.surrey.ac.uk/Personal/D.Jefferies/stubs.html • Application • http://www.sss-mag.com/pdf/arrl_circles.pdf

  14. Time Domain Reflectometry • Principle • Launch a pulse or a step waveform into the cable • Monitor reflected signal • Delay: location of mismatch • Magnitude: amount of mismatch • Equipment • http://www.tek.com/Measurement/App_Notes/55_14601/eng/55W_14601_1.pdf • Pulse generator

  15. Time Domain Reflectometry • Measurements • http://bwrc.eecs.berkeley.edu/Classes/EE290C_S04/lectures/Lect03_measurement.pdf • http://literature.agilent.com/litweb/pdf/5988-6505EN.pdf • Build Your Own TDR • http://www.web-ee.com/Schematics/TDR/tdr.htm

  16. Analysis for Digital Pulse • Pulse Analysis • http://www.mwrf.com/Articles/Print.cfm?ArticleID=5433 • Pulse Distortion • EESoft Modeling http://eesof.tm.agilent.com/pdf/asia_forum_2004_07.pdf

  17. Reading and Exercise • Reading • http://cktse.eie.polyu.edu.hk/eie403/Transmissionline.pdf • Exercise • http://courses.ece.uiuc.edu/ece450/Homework/HW3_F2004.pdf • Reference • http://www.connectorwizard.com/reference/articles/pdfs/GoldenStandard_Part2.pdf

  18. Chapter Review • Transmission Lines • balanced and unbalance • Balum • Characteristic Impedance • Reflection Coefficient • Voltage Standing Wave Ratio • Smith Chart • Impedance Matching • Time Domain Reflectometry

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