Electronics > Beginners
Why am not able to get a grasp of PCB designing?
ebastler:
--- Quote from: Rerouter on November 25, 2019, 07:43:17 am --- you can also draw curvy traces with kicad with a little work if you need to work around very compact spacing. (free angle mode, and replace the corner twice to get very close to a smooth curves
--- End quote ---
That looks rather vintage! Just as wobbly as the classic taped layouts. ;)
I can see the benefit this might have in some tight spots. But without full support in the PCB layout software -- splines or such to create smooth curves, and precise matching of the shape of neighboring traces in push-and-shove mode -- it seems very burdensome, and the result is not as neat as I would like.
thinkfat:
It seems you're routing some differential signals, going by the net labels on the top right socket (DPA1, DMA1). You'll need to give these priority during routing. Make sure you rename the nets to DA1_P, DA1_N, or KiCad will not be able to figure out the routing pairs. I'm guessing you are going for a standard FR4 board with 1.6mm final thickness, that'll make correct impedance nigh impossible, but you should at least get the lengths matched. Should not be a huge problem for USB1 class speeds.
redgear:
--- Quote from: thinkfat on November 25, 2019, 09:56:25 am ---It seems you're routing some differential signals, going by the net labels on the top right socket (DPA1, DMA1). You'll need to give these priority during routing. Make sure you rename the nets to DA1_P, DA1_N, or KiCad will not be able to figure out the routing pairs. I'm guessing you are going for a standard FR4 board with 1.6mm final thickness, that'll make correct impedance nigh impossible, but you should at least get the lengths matched. Should not be a huge problem for USB1 class speeds.
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Thanks. Why shouldn't I use the DMA/DPA labels?
thinkfat:
--- Quote from: redgear on November 25, 2019, 10:09:16 am ---
--- Quote from: thinkfat on November 25, 2019, 09:56:25 am ---It seems you're routing some differential signals, going by the net labels on the top right socket (DPA1, DMA1). You'll need to give these priority during routing. Make sure you rename the nets to DA1_P, DA1_N, or KiCad will not be able to figure out the routing pairs. I'm guessing you are going for a standard FR4 board with 1.6mm final thickness, that'll make correct impedance nigh impossible, but you should at least get the lengths matched. Should not be a huge problem for USB1 class speeds.
--- End quote ---
Thanks. Why shouldn't I use the DMA/DPA labels?
--- End quote ---
--- Quote ---or KiCad will not be able to figure out the routing pairs
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The interactive router in KiCad has a special mode for differential pairs, but you need to name the nets of the pair accordingly. They must end in "_P" and "_N".
jhpadjustable:
+ / - are also acceptable. e.g. A1D+ and A1D-
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