Contents
How does Altium match length?
A matched length rule that defines the length matching requirements between pairs. To configure the rule to test the length of one pair against the length of another pair, enable the Group Matched Lengths option. A second, higher-priority matched length rule that defines the within-pair length matching requirements.
What is length matching?
In simple words, PCB trace length matching is the process of ensuring two or more signal traces are of the same length. PCB trace length matching ensures that these traces, where the timing of the arrival of the pulses is critical, are matched to equal length.
How do you route differential pairs in Altium?
Differential pairs are routed as a pair – that is, you route two nets simultaneously. To route a differential pair, select Interactive Differential Pair Routing from the Route menu. You will be prompted to select one of the nets in the pair; click on either to start routing.
How do you measure net length in Altium?
select the whole net for which you want to find length using a filter (say in net etc..) and then go to Reports -> measure selected objects. This should give the total length of the net.
How do you measure distance in Altium?
This command can be accessed from the PCB Editor and the PCB Library Editor by:
- Choosing the Reports » Measure Distance command from the main menus.
- Using the Ctrl+M keyboard shortcut.
How do you route a differential signal?
Route the Diff Pairs Together
- Avoid using vias if possible.
- Inner layer routing is preferable to minimize crosstalk, but that means transitioning through the layers with vias.
- Keep the diff pairs isolated from other traces.
- If possible, consider broadside diff pair routing on adjacent signal layers.
How does differential pair matching work in Altium?
It also accounts for the complex geometry used in length matching segments and parasitic inductance and capacitance along an interconnect. The interactive routing and differential pair length matching features in Altium Designer ® include an integrated electromagnetic solver, giving you instant access to delay tuning as you route your board.
How are length tuning segments added in Altium?
Length tuning segments are added by simply wiping the cursor along the route path, with the dimensions and positions of the various tracks and arcs that make up the tuning segments automatically calculated and inserted by the length tuning algorithm.
What does impedance controlled routing on Altium do?
Impedance controlled routing ensures that the signal that leaves an output pin is correctly received by the target input pins. Matching the route lengths ensures that timing-critical signals arrive at their target pins at the same time.
How to set target length in Altium Designer 21?
The Target Length section of the panel includes options for selecting the required Target Length mode. The lower section of the panel includes options that define the shape and dimensions of the tuning pattern, which can also be controlled interactively using the shortcuts detailed above. Manual – enter the length in the Target Length field.