[SI-LIST] Re: doubt in lossless transmission line funda

Canes,

It depends on what degree of correlation you are looking for and what 
values you plug in.  When the extra rise time due to capacitive loading 
is small, the correlation may be good.  With heavy capacitive load, 
however, the electrical length of the line does matter because you 
essentially have an LC resonator, where L the the Zo*tpd inductance of 
the transmission line and C is your load capacitance. Eventually the 
source impedance may matter as well.

Regards,

Istvan Novak
SUN Microsystems


Canes Venatici wrote:
> Hi all,
> I was driving a lossless transmission line with a near-end rise time of 'tr' 
> (10-90% of Vdd) with an amplitude of Vdd .
> The far-end was loaded with capacitance load. While evaluating the far-end 
> transition times the expected  rise time  (10-90% of Vdd)
> is sq.rt(square(tr) + square(2.2*Z0*Cload)). Spice simulation results are not 
> correlating with the formula. 
> Is there an error in my formula??? Please help!
> Regards,
> Canes
>
>
>
>   

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