Re:Tough Times on the Road to StarCraft
by hengheng on Saturday January 24, 2015 @09:43AM
(#8939677)
> electricity is significantly slower
As a rule of thumb, most signals travel at half the vacuum speed (√ε_r for FR4 is 2.15), with a slight variation due to the copper trace shape. So, 150 mm/ns or 6 inch/ns one-way. I love how we can say nowadays "That's not all that much, is it."
As a rule of thumb, most signals travel at half the vacuum speed (√ε_r for FR4 is 2.15), with a slight variation due to the copper trace shape. So, 150 mm/ns or 6 inch/ns one-way. I love how we can say nowadays "That's not all that much, is it."