[SI-LIST] Capacitance calculator

All SI experts,
 
I am currently simulating the capacitance of 2 1" parrallel round wires. I
want to verify the simulation result. Can any one provide some formula to me
so I can verify the result?
 
From Dr Johnson's "High speed digial design", the book said C = er * L *
0.765*10^-12 / ln(2 *S/D) where L=length of the wires, S = center-to-center
distance between 2 wires, D = diameter of each wire. However, the calculated
value and the simulated value are not matched, ie: C_cal = 0.8pF and C_sim =
0.4-0.5pF. I am wondering is there any other formula for capacitance
calculation. However, from the same simulation, I obtained L_sim = 19.5-20.5
nH and from Dr. Johnson's book L_cal = 20.16nH and . I believe the L is
acceptable.
 
Thanks,
Tim


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