Lect35BounceDiag - B o u n c e D ia g ra m s for...

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Bounce Diagrams for Transmission Lines Lectures 35
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Solution to TL equation V = V + + V " I = 1 Z 0 ( V + " V " ) = I + + I " I + = V + Z 0 I " = " V " Z 0 Solution to TL equation is summation of traveling waves propagating in the +z or -z directions
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Example Z 0 z=0 z=l R L R g V 0 t=0, close v p
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Example, t=0 R g V 0 + - V + I + At t=0, a wave originates at z=0 and starts to travel in the +z direction Until the wave propates to the end and reflects back, there is no V - wave, and the load resistance R L has no effect. Z 0
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Example t=T T = l v p Time required for V + wave to reach load end of the TL z=l R L + - (V + +V - ) (I + + I - ) Wave reflects to set up a “-” wave IN ADDITION TO the “+” wave
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Definition: Reflection Coefficient Voltage Reflection Coefficient Current Reflection Coefficient " = V # V + = R L # Z 0 R L + Z 0 I " I + = " ( V " / Z 0 ) ( V + / Z 0 ) = " V " V + = "#
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Example, t=2T R g V 0 + - V + +V - +V -+ Z 0 I + +I - +I -+ Reflected wave travels back towards the source, and gets there at t=2T The wave gets RE-REFLECTED at the source end and
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This note was uploaded on 01/17/2011 for the course ECE 305 taught by Professor Staff during the Summer '08 term at Michigan State University.

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Lect35BounceDiag - B o u n c e D ia g ra m s for...

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