A
Andrew Holme
- Jan 1, 1970
- 0
I'm designing a board with a 100-ohm diff. pair carrying LVDS. For economy,
I want to make a 2-layer PTH board with a solid copper ground plane on the
bottom. The PCB fab said this was impossible because of board thickness.
After playing with a trace impedance calculator, I see what they mean, at
least as far as normal track widths are concerned. To get 100-ohms
differential on a 62 mil thick 2-layer board, I need 60 mil wide tracks
spaced 40 mil apart. So my question is: what's wrong with that?
TIA
I want to make a 2-layer PTH board with a solid copper ground plane on the
bottom. The PCB fab said this was impossible because of board thickness.
After playing with a trace impedance calculator, I see what they mean, at
least as far as normal track widths are concerned. To get 100-ohms
differential on a 62 mil thick 2-layer board, I need 60 mil wide tracks
spaced 40 mil apart. So my question is: what's wrong with that?
TIA