How to Create a High-Speed Schematic Design in KiCad

In this tutorial, we will cover schematic design in KiCad. We will also discuss high-speed PCB design with the identification of differential pairs and the marking of high-current traces.

How to Create a Schematic Design in KiCad
We will demonstrate how to create a simple schematic design in KiCad and we will talk about the factors we need to consider when doing a schematic design for a high-speed design. Let’s start with the schematic part.
First, you need to create a new project. Go to File on the left-hand side, click New and Project.  Choose the location where you want to save this new project and name it. In this demo, we will name it LED project. Click Save.
As you can see, the two files are created over here. There are the layout file and the schematic file. Let’s open the schematic file first.
How to Place Components on a Schematic
For this demo, we are considering a simple schematic design for a battery, a regulator and a LED. This schematic will be used to light up a simple LED.
Click this symbol on the left hand side and a window will pop up. Search for a battery among the components. We will select a single-cell battery, as you can see over here. Simply click the screen to place the battery on the schematic. 
Let’s repeat the same action to find a resistor. Select the one you want and place it on your schematic.
Let’s now choose a LED and two capacitors and regulators. 
You can see over here an unpolarized capacitor, which is basically a ceramic capacitor, and a polarized capacitor, which is for electrolyte. We will take the unpolarized one for now.
How to Create a New Library
Now we require a regulator, which we will create. This is very simple. Click Create, delete and edit symbols on the top. A window will pop up. On the left top side, click File and select New Library. For this example, we will name it LED Project and save it to the library table Project. 
Watch our tutorial on how to create a symbol library in KiCad .
Now go to File again, select New Symbol and search for the library that you just created. Name the new symbol, such as, in this case, LM7805, which is a five-volt regulator. 
You need to create a symbol for every component. Every component has its own data sheet and its own serial part number.
You need to find the data sheet for the part number. You can see on this screen, this is the data sheet of LM7805. You need to see the pin configurations between this data sheet, which is registered by the manufacturer.
In this case, there are four different packages. These packages depend on the manufacturer part number or MPN . so you will have to decode the MPN which will give you the correct package. For now, we will require these three pins: input, ground and output.
You can see that there are more connectors, such as Tab....