[SI-LIST] doubt in lossless transmission line funda

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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