Many Signals in one signal layer

Question

Hello,

I am designing a 4 layered board in Eagle. My ground layer has 3 types of grounds namely GND,AGND,GND1.

one of my signal layer is $GND and so only my GND shows thermal vias on that layer while other (AGND,GND1) show isolated rings...plz help me with this poblem..

Richard_H · Accepted Answer

Hello,

to realize three different GND signals within one layer, you have to use polygons in one of the inner signal layers. Please don't use a Supply layer (which has the a $ character at the beginning) because such a supply layer is displayed and plotted inverted and leads exactly one signal. The signal you specify with the supply layer's name.

So what you have to do is to use an inner layer and draw three different POLYGONs. Name the polygons the same as the signal they should belong to. And think about the polygon property "Rank" which determines the priority of the polygon. Additional help can be found in our FAQ:

http://www.cadsoftusa.com/training/faq/#17

Regards,

Richard

Former Member · Answer

tkhan schrieb:

Hello, I am designing a 4 layered board in Eagle. My ground layer has
3 types of grounds namely GND,AGND,GND1. one of my signal layer is
$GND and so only my GND shows thermal vias on that layer while other
(AGND,GND1) show isolated rings...plz help me with this poblem..

Just use it as a regular routing layer, with polygons.

Tilmann

Former Member · Answer

tkhan < communitymanager@premierfarnell.com > wrote: Hello, I am designing a 4 layered board in Eagle. My ground layer has 3 types of grounds namely GND,AGND,GND1. one of my signal layer is $GND and so only my GND shows thermal vias on that layer while other (AGND,GND1) show isolated rings...plz help me with this poblem.. Use Supply Layers like $GND with reat care! You can't have anything other in that layer. In your case, rename the $GND layer to it's old name and the other polygons sould fill up Bye -- Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt - Tel. 06151 162516 - Fax. 06151 164321 -