RE: [SI-LIST] : A basic question

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From: kholman@celestica.com
Date: Fri Mar 17 2000 - 08:06:20 PST


Prop delay = (u x e)^1/2= (4pix10^-7 x 8.854x10^-12)^1/2= 3.33ns/m or 84ps/in
in free space

Prop delay= (uur x eer)^1/2 = (4pix10^-7 x (4.7)8.854x10^-12)^/12 = 7.23ns/m or
184ps/in in FR4 assuming 4.7 relative permittivity

Characteristic impedance Zo= (impedance per unit length/shut admittance per
unit length)^1/2

                                                           ={(R
+jwL)/(G+jwC)}^1/2

                      Assuming lossless conductors

                                                             =(jwL/jwC)^1/2

                                                             =(L/C)^1/2

Ken

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