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Class07_Using_Transmission_lines

# Class07_Using_Transmission_lines - Using Transm ission Line...

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Using Transmission Lines III – class 7 Purpose – Consider finite transition time edges and GTL. Acknowledgements: Intel Bus Boot Camp:  Michael Leddige

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Using Transmission Lines 2 Agenda Source Matched transmission of signals with finite slew rate Real Edges Open and short transmission line analysis for source matched finite slew rates GTL Analyzing GTL on a transmission line Transmission line impedances DC measurements High Frequency measurements
Using Transmission Lines 3 Introduction to Advanced Transmission Line Analysis Propagation of pulses with non-zero rise/fall times Introduction to GTL current mode analysis Now the effect of rise time will be discussed with the use of ramp functions to add more realism to our analysis. Finally, we will wrap up this class with an example from Intel’s main processor bus and signaling technology.

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Using Transmission Lines 4 Ramp into Source Matched T- line Ramp function is step function with finite rise time as shown in the graph. The amplitude is 0 before time t 0 At time t 0 , it rises with straight-line with slope At time t 1 , it reaches final amplitude V A Thus, the rise time ( T R ) is equal to t 1 - t 0 . The edge rate (or slew rate) is V A / ( t 1 - t 0 ) t 0 t 1 V A Z  , Τ V V l I I V S R S T = T 0 l
Using Transmission Lines 5 Ramp into Source Matched T- line t 0 t 1 V A Z 0  , Τ 0 V 1 V 2 l I 2 I 1 V S R S T = T 0 l

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Using Transmission Lines 6 Ramp Function Ramp function is step function with finite rise time as shown in the graph. The amplitude is 0 before time t 0 At time t 0 , it rises with straight-line with slope At time t 1 , it reaches final amplitude V A Thus, the rise time ( T R ) is equal to t 1 - t 0 . The edge rate (or slew rate) is V A / ( t 1 - t 0 )
Using Transmission Lines 7 Ramp Cases When dealing with ramps in transmission line networks, there are three general cases: Long line ( T >> T R ) Short line ( T << T R ) Intermediate ( T ~ T R )

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8 Real Edges risetime ns 0.5 = risetime t i_thresholds 1 i_thresholds 0 + ( 29 t i_thresholds 0 ( 29 - = i_thresholds hist threshold a , ( ) = define 10 and 90% thresholds threshold 2 .9 A = threshold 1 .1 A = Neat trick to find rise time 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 time in nanoseconds Amplitude b i A a i - = a i A 1 e sajf τ r t i n - - = Define Wave signal vs. time array sajf .849 = n 3 = A 1 = τ r .5 ns = Spec Slew Adj Fctr Spec Waveshape Spec amplitude Specify Rise Time ns 10 9 - sec t i tmin tmax imax i + = i 0 imax .. = imax 1000 = tmax 1.5 ns = tmin 0 ns = ps
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Class07_Using_Transmission_lines - Using Transm ission Line...

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