[SI-LIST] Re: Reflection due to far end capacitor

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: sinnovate88@xxxxxxxxxxx,si-list@xxxxxxxxxxxxx
  • Date: Fri, 18 Aug 2006 02:58:52 -0700

Shekhar, no your conclusion would be correct only if the line were 
very short compared to the signal rise/fall time.

Steve

At 01:05 AM 8/18/2006, shekhar sharma wrote:
>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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