[SI-LIST] Reflection due to far end capacitor

  • From: shekhar sharma <sinnovate88@xxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Fri, 18 Aug 2006 09:05:36 +0100 (BST)

Hello all,
                 I am simulating a driver with 50-ohm transmission line. Far 
end of the transmission line is terminated by 50-ohm resistor. In normal 
simulation there is no reflections are seen. When I add a capacitor at the far 
end, it shows a glitch at near end after 2*td. It seems that transmission line 
is considering capacitor as short for signal transition. But I think this is 
not the real effect of capacitor on the transmission line. If load capacitor at 
far end is Cl, it will change the caracteristic impedance of the transmission 
line and it will become Zo=sqrt(l/(c+Cl/L)). Where L is the length of the 
transmission line and l and c are the per unit parameters.
  Does my conclusion is correct?
  Please shed some light on it.
   
  Thanks in Advance,
   
  Shekhar
                                
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