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Beyond the basics of wires and components, there are many labels that can be
{intro to more advanced annotations in Altium. Highlight how it enables automatic feature in Altium like differential pair routing, complex clearances and creepages and more}
Differential Pairs
{as title implies}
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added to indicate special properties of nets and components. All of these labels come with extra Altium features to ultimately assist in implementation of the feature in layout.
Some of the most common uses are differential pairs, high voltage isolation, routing restrictions, and impedance matching.
Placing Labels and Blankets
The {label} in Altium can be placed from a few different menus, including the schematic toolbar, right clicking in schematic, or the window toolbar
{images of different methods of accessing}
Once selected, the {} can be placed on any wire, pin, or net label. It can then be assigned properties to actually apply to the net that it is touching.
{as name implies}
Types of Labels
{bullet point all the types and benefits. If I realize this needs to be built out more I’ll do so}
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Differential Pairs
Differential pairs are a feature in Altium that allows the user to tell Altium if a pair of signals should be routed differentially. If this is the case, it will apply restrictions to keep the traces impedance matched to a value of the designers choice.
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The differential pair marker can be found in a few different menus, including the schematic toolbar and just right clicking anywhere in schematic. {images of these two methods} A marker must be placed on each of the two nets that make up the differential pair. Additionally, each net must have a net label of the same name, one ending in “_N” and the other in “_P”, indicating “negative” and “positive”. This is usually an arbitrary distinction, but depends on your circuit {image showing implemented differential pair} Once created in schematic, the exact impedance requirement is set using design rules. This can be set by using the design rules label mentioned in the above section.
{example image of setting the DR for impedance selection in schematic} |
“Advanced” Schematic Features
This section will encompass any features that we use frequently, but are beyond the scope of a basic introductory tutorial.
Busses
{talk about busses}
Impedance Matching
{talk about setting impedance in schematic and then link to layout since thats where you really define it}
{More?}
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