Transcription of S- Parameters and Impedance Transformers
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S- Parameters and Impedance Transformers
PerrottHigh Speed Communication Circuits and SystemsLecture 3S- Parameters and Impedance TransformersMichael H. PerrottFebruary 9, 2004 Copyright 2004 by Michael H. PerrottAll rights PerrottWhat Happens When the Wave Hits a Boundary? reflections can occurxzExHyyZLExHyZLIncident WaveReflected PerrottWhat Happens When the Wave Hits a Boundary? At boundary-Orientation of H-field flips with respect to E-field Current reverses direction with respect to voltagexzExHyyZLExHyZLIncident WaveReflected PerrottWhat Happens At The Load Location? Voltage and currents at load are ratioed according to the load impedancexzyZLZLI ncident WaveReflected WaveIiIiIrIrViVrVoltage at LoadCurrent at LoadRatio at PerrottRelate to Characteristic Impedance From previous slide Voltage and current ratio in transmission line set by it characteristic Impedance PerrottDefine Reflection Coefficient Definition:-No reflection if L= 0 Relation to load and characteristic impedances Alternate expression-No reflection if ZL= PerrottParameterization of High Speed Circuits/Passives Circuits or passive structures are often connected to transmission lines
For high speed circuits with transmission lines, achieving maximum power transfer is important-Maximum power transfer coincides with having zero reflections (i.e., L = 0) Can we ever win on both issues? Voltage Power 25
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