3D Simulations for Signal Integrity

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Knee Frequency � Howard Johnson, , in his book High g Speed p <strong>Signal</strong> g Propagation, references a calculation <strong>for</strong> the “Knee frequency” which is a guide that helps determine the relevant spectral content of a digital signal � It is defined as: f knee 0. 5 ≅ t r � Where tr is the 10%-90% rise time of the signal � This frequency represents the frequency below which, the majority of the spectral content is contained
Knee Frequency - Example � Simulate a PRBS signal � Bitrate = 10 Gbps � t r = 40 ps p ( (0-100%) ) � 32 ps p ( (10-90%) ) � f knee = 15.625 GHz
Page 1 and 2: 3D Simulations for Signal g Integri
Page 3 and 4: Prerequisites � Need some guideli
Page 5 and 6: Simulation Parameters � Solution
Page 7: Adaptive Solution Setup � The fre
Page 11 and 12: Implications of F kknee � How can
Page 13 and 14: Implications of F kknee
Page 15 and 16: � Solver - Iterative Iterative So
Page 17 and 18: Frequency Sweep Options for Time Do
Page 19 and 20: Interpolating Sweep � This method
Page 21 and 22: S11 S (dB) Interpolating Frequency
Page 23 and 24: “Active” Active S-parameters S
Page 25 and 26: Causality � Another issue when de
Page 27 and 28: Causes of Non-causality Non causali
Page 29 and 30: Frequency Dependent Materials Piece
Page 31 and 32: Frequency Dependent Data Points �
Page 33 and 34: Causality - Example � 2” 2 Coax
Page 35 and 36: Causality - Example � Another way
Page 37 and 38: DC Extrapolation � All non-linear
Page 39 and 40: INTERPRETING SIMULATION RESULTS
Page 41 and 42: Time Domain Reflectometry � TDR t
Page 43 and 44: Time Domain Reflectometry � Posit
Page 45 and 46: Geometry Manipulation � Geometry
Page 47 and 48: Geometry Manipulation
Page 49 and 50: Optimization of SI Problems � Unl
Page 51 and 52: Optimization of Via � Set trace w
Page 53 and 54: Optimized Via - TDR � We can see

3D Simulations for Signal Integrity

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