Class06_Transmission_line_basics

Class06_Transmission_line_basics - Tr ansmi ssi on L i ne...

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  Transmission Line Basics II - Class 6 Prerequisite Reading assignment: CH2 Acknowledgements: Intel Bus Boot Camp:  Michael Leddige
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 Transmission Lines  Class  6 2 Real Computer Issues Dev a Dev b Clk Switch  Threshold Measured  here An engineer tells you the measured clock is non-monotonic  and because of this the flip flop internally may double clock  the data. The goal for this class is to by inspection determine  the cause and suggest whether this is a problem or not. data
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 Transmission Lines  Class  6 3 Agenda The Transmission Line Concept Transmission line equivalent circuits and relevant equations Reflection diagram & equation Loading Termination methods and comparison Propagation delay Simple return path ( circuit theory, network theory come later)
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 Transmission Lines  Class  6 4 Two Transmission Line Viewpoints Steady state ( most historical view) Frequency domain Transient Time domain Not circuit element Why? We mix metaphors all the time Why convenience and history
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 Transmission Lines  Class  6 5 Transmission Line Concept Power Plant Consumer H ome   Power Frequency (f) is @ 60 Hz   Wavelength ( λ ) is 5 ×  10    ( Over 3,100 Miles) 
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 Transmission Lines  Class  6 6 PC Transmission Lines Integrated Circuit Microstrip Stripline Via Cross section view taken here PCB substrate T W Cross Section of Above PCB T Signal (microstrip) Ground/Power Signal (stripline) Signal (stripline) Ground/Power Signal (microstrip) Copper Trace Copper Plane FR4 Dielectric W   Signal Frequency (f) is         approaching 10 GHz   Wavelength ( λ ) is 1.5 cm     ( 0.6 inches)  Micro- Strip Stripline
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 Transmission Lines  Class  6 7 Key point about transmission line operation The major deviation from circuit theory with transmission line, distributed networks is this positional dependence of voltage and current! Must think in terms of position and time to understand transmission line behavior This positional dependence is added when the assumption of the size of the circuit being small compared to the signaling wavelength ( 29 ( 29 t z f I t z f V , , = = V 1 V 2 dz I 2 I 1 Voltage and current on a transmission line is a function of both time and position .
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 Transmission Lines  Class  6 8 Examples of Transmission Line Structures- I Cables and wires (a) Coax cable (b) Wire over ground (c)Tri-lead wire (d) Twisted pair (two-wire line) Long distance interconnects (a) (b) (c) (d) + - + + + - - - -
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 Transmission Lines  Class  6 9 Segment 2: Transmission line equivalent circuits and relevant equations Physics of transmission line structures Basic transmission line equivalent circuit ?Equations for transmission line propagation
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 Transmission Lines  Class  6 10 Remember fields are setup given an applied forcing function.
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Class06_Transmission_line_basics - Tr ansmi ssi on L i ne...

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