That is all for now, I hope this tutorial(cadence allegro tutorial) would be helpful for you. The detailed discussion on the “Vias” will follow in the next tutorial. The route (copper) that needs to be connected from top to bottom layer is connected to the “via” which is also attached to the copper etch at the bottom. “Via” can be thought of as the metallic rod which penetrates through the PCB and enables the connection between the layers.
In the cadence allegro tutorial following image all the layers are tuned visible by checking the check box of all the layers.Īt this point most of you might be thinking that how the connection between the top, bottom and other layers are established. The following figure shows the Bottom layer checked and all other layers left unchecked so only bottom layer is visible. Only the check box of the “Top Layer” is checked so only top layer is visible as shown in the blue colour. The PCB is six layer as can be seen in the stack-up. In the “Visibility” window the PCB stack-up is shown as represented in the above image. The visibility window is as shown in the following image: It is recommended to go through my previous tutorial in order learn about the two windows.
These two windows are of vital importance while working with commands, I have discussed in detail about the “Options” and “Find” windows in my previous tutorials. The “Visibility” window is the third and last window that is shown at the extreme right side of the GUI of the Allegro PCB Designer along with “Options” and “Find” window. Let us now discuss the “Visibility” window. The top side of the PCB is represented by the Blue colour and the Bottom side is represented by the pink colour. The following image shows the layout design of two layer PCB. Eight layer PCB stack-up is as shown in the following image: The PCB layer stack-up is defined as the combination of copper layers and insulation layers on the printed circuit board. The number of layers on the PCB is determined by the PCB designer according to circuit complexity. Similarly there are three layer and four layer PCBs. On a two layer PCB more components can be placed and more routing can be done. “Two Layer PCB” is as shown as shown in the following image: That PCB will be called “Two layer PCB” or “Double Layer PCB”. However there are some situations when routing and component placements is to be done on both sides of the PCB. A single layer PCB is shown in the following image:
Another important thing is that all electronic components employed are through-hole package. A simple circuit is fabricated on a single layer of the PCB only that is all the electronic components are placed on one side of the PCB and routing is done on the other side. If you are studying engineering you might have seen the circuit assembled on the printed circuit board.
Introduction Vias and GND Plane in AllegroĪLL Orcad Allegro Tutorial for Beginner Ask free to Question us