My Hobbies - Circad Course - Lesson 8
Pcb Areas Filling

Parabola

Barra Colore


Some pcb needs a ground plane, conductive or shield type, or with outdrawing the signal tracks. The two images above shows two ground planes that are different only for the distance between pads and signal lines.

With the command SC you can select the dimension of the tracks that will be used to fill ("Flood Line") and the distance between pads and flood track ("Flood to Line") and also from the pads ("Flood to pad"). The left pcb has been maked using, respectively, the values 2, 10 and 10, and the right pcb has been maked with the values 2, 20 and 40.


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Once you've selected the fill parameters with SC, using BI or BG you must define the area where Circad will create the signal plane. The area can include the entire pcb, a part or an area bigger than the pcb area. To make the planes showed in this lesson, you must select an area that include the entire TUTOR1.PCB pcb.

Once you've selected the reference area, with BF you'll obtain the signal plane. If you don't like the final result you can remove the plane with uu. In the picture beside you can see the plane obtained with a selection smaller than the entire pcb.

With the BF option you can also modify the fill parameters. Some of these, green enhanced, are the same of the SC option. The "Crosshatch Grid" field value sets the distance between lines when you use the Hatch Fill option.

Circad will fill the layer you select in the "Target Layer" field, using the "Source Layer" field (multiple selection it's possible) as obstacle layers to avoid. Usually, you need to select all the signal layer and the "Pad Master" layer.

Then, using the Flood Fill option, you'll obtain the first two examples.

Using the Hatch Fill option it's possibile to make a special conductive plane with net crosslinked lines. The pcbs beside was created with, respectively, the values 2, 20 and 40 for the left one, and 20, 20 and 20 for the right one. To remove the plane use UU. These planes are useful to make some kinds of sensor or to obtain a light shield plane.

Using the Hatch Fill option, but selecting the value 1.000 in the "Crosshatch Grid" field you can make a plane that contains the contour lines of pads and signal lines. To remove the plane use uu, or DL to remove every net tracks remaining. This function can be used, transferring the contour lines from a signal layer to a serigraphic one, for example from the Bottom Copper layer to the Top Silk one, to hilight some sections of a pcb.



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