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I am facing an error while practicing a reference design of DLP-2232M-G board downloaded from Mentors website.

The design engineer of this board has used 2 layer (TOP and BOTTOM ) keeping 3 to 21th layer inactive. Take a look " layer setup", in both case he assigned GND at "Assign Nets". 2_layer

After I made schematic in PADS logic and connect with PADS layout, I found GND trace exists on PADS layout design.

Take a look, 2 capacitors ends are shorted, they should be "GND". In this design, no layer for "GND" has been called.

gnd

If you feel any setting is necessary in "Design rules", let me know.

Thank you.

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  • \$\begingroup\$ You don't always need a GND layer, if you're making a cheap board or want to keep it single sided then using traces for GND is fine in most applications \$\endgroup\$ – Doodle Mar 2 '17 at 8:14
  • \$\begingroup\$ Need to be more specific on PADS design setting/ display setting, this design contains routed path on both side. gnd traces has appeared on what I am doing. \$\endgroup\$ – Hasan Mar 2 '17 at 8:32
  • \$\begingroup\$ Is there a GND net on the actual schematic? \$\endgroup\$ – Doodle Mar 2 '17 at 8:47
  • \$\begingroup\$ Yes, it has. "Off-pages" are also available. \$\endgroup\$ – Hasan Mar 2 '17 at 9:03
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    \$\begingroup\$ If GND is a net on the actual schematic then when it has been pulled over for PCB layout then it will expect tracks to connect the different parts of the net, hence the yellow guide lines. I think the confusion you're making is that GND must be it's own separate layer. You can put whichever tracks you want on whichever layer you want. \$\endgroup\$ – Doodle Mar 2 '17 at 9:07
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I do appreciate your instructions. Sudden tricks came in my mind, that was very common setting.

To invisible GND tracks, View>Nets> View nets dialog box will appear, select GND from the net list and add it in View list. After that, unchecked the View Details ( Trace plus the following un-routes ) option.

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  • \$\begingroup\$ If this is your solution you need to accept it. \$\endgroup\$ – Chris Stratton Jun 21 '17 at 3:23
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There's nothing wrong with it. Just connect all the ground using bottom layer using copper pour function. Highlight it green by going into Nets function [CTRL + Shift + N]

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  • \$\begingroup\$ Yes, it might be alternative solution. Using key board things going to be more easy. \$\endgroup\$ – Hasan Aug 8 '17 at 20:38

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