Hi,
ever heard of tau? or cut off frequency?
If not, you need to learn about it. Do an internet search for "basic analog filter tutorial", or "basicRC filter tutorial" or similar
Tau = R x C
fc = 1 / (2 x Pi x R x C)
If your tau = 1M x 1uF= 1s but your diagram also should show 1s (or in this magnitude) but it shows only 6ns.
So it´s a factor of 160.000.000 off!
Btw: your schematic is inclomplete, and it doesn´t even show the values of the parts.
Also "r= 600ohm, c= 100fF, load= port(resistance= 1M ohm)" is meaningless as long as you don´t tell us what "r" and what "c" you refer to.
Klaus