lec8_tline_basics_termination_schemes

lec8_tline_basics_termination_schemes - Transmission Line...

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Unformatted text preview: Transmission Line Basics Transmission Line Basics and Termination Schemes Ref: Fundamentals of Microsystems Packaging (Ch 4) edited by Rao R. Tummala Class Notes Transmission Line Basics Delay in Package Interconnects 50 Transmission Line Basics How do you capture Delay ? How do you capture Delay ? Physical Electrical Frequency Distributed Transmission Line C C R R L R C R L Transmission Line Basics Courtesy: Altera Transmission Line Basics When do Interconnects behave as When do Interconnects behave as Transmission Lines ? Transmission Lines ? l t r r 2 33 . 33 ps When the above condition is satisfied, interconnections should be treated as transmission lines (True for Homogeneous Medium single dielectric ) Transmission Line Basics Single Chip Vs Multi Chip Packages Single Chip Vs Multi Chip Packages Single Chip Package Multi Chip Package What is the length of the longest interconnections in Single Chip and Multi Chip Packages ? If t r = 100ps, then lines with l > 0.75cms will behave as a Tline In a medium with r = 4. Transmission Line Basics Common Interconnect Structures Common Interconnect Structures Wire on Ground Co-axial Twisted Pair Transmission Line Basics Common Interconnect Structures in Common Interconnect Structures in Packages Packages Parallel Plate Microstrip Stripline (Symmetric) Embedded Microstrip Stripline (Asymmetric) Co-planar Transmission Line Basics Common Interconnect Discontinuities in Packages Common Interconnect Discontinuities in Packages Transmission Line Basics Transmission Line Equivalent Circuit Transmission Line Equivalent Circuit Outer Conductor Inner Conductor Dielectric When electricity flows, there is a movement of charge carriers down one conductor and back on the other. The charge has some momentum and wants to keep moving once it has started. Hence it has series inductance. Metal is not a perfect conductor of electricity. Hence it has series resistance. Equal and opposite charge is stored instantaneously on the two conductors. Hence it has shunt capacitance. Dielectric is not a perfect insulator. Hence it has shunt conductance. Transmission Line Basics Transmission Line Fundamentals Delay o To capture delay, inductance (L) and Capacitance (C) are required o The two are related by Delay c LC = = = 1 L: Inductance per unit length (H/cm)...
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lec8_tline_basics_termination_schemes - Transmission Line...

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