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When to use same net only clearance in Altium?
Use this constraint to configure the clearance when the nets in the differential pair must be closer together than allowed by the general clearance. For a defined Same-Net Only Clearance rule, the general approach is that if two objects are touching (i.e. connected), then they are not deemed to be in violation of the rule.
How to create differential pair routing rules in Altium?
If the Net Class is not included, individual Differential Pair Routing rules will be created for every differential pair under the blanket. A Blanket can be used to configure multiple nets as differential pair members, create a Net Class of these nets, and apply a Differential Pair Routing design rule.
How are design rules created in Altium Designer 21?
The latter, in combination with rule-scoping, provides the flexibility to build a concise and targeted set of clearance rules to meet even the most stringent of clearance needs. All design rules are created and managed within the PCB Rules and Constraints Editor dialog.
Do you need pair to pair clearance for differential pairs?
Differential pairs present unique design challenges, often requiring a specific within-pair clearance as well as a pair-to-pair clearance, and potentially a third rule to control the pair-to-all other nets, clearance.
How to design a PCB in Altium Designer?
To successfully complete a PCB design using Altium Designer’s PCB Editor, the constraints of the design should be thought out and implemented as a well-honed set of design rules.
What are the rule categories in Altium Designer?
The following rule categories and types are supported in Altium Designer: Electrical – this category offers the following rule types: Clearance, Short-Circuit, Un-Routed Net, Un-Connected Pin, and Modified Polygon.
Which is the clearance constraint between split plane and netc6?
Clearance Constraint: (32.36mil < 34mil) Between Split Plane (GND) on Internal Plane 1 And Split Plane (NetC6) on Internal Plane 1 Clearance checking between split plane regions on an internal layer. In this case, the clearance value of 34mil has been entered in the Region-Region cell, as clearances
How is different differential pair constraint applied in Altium?
Different Differential Pair – constraint is applied between any two primitive objects belonging to different nets of different differential pairs (e.g. a track in DiffPair1 and a track in DiffPair2 ). The rule does not apply between primitives in the two nets in the same differential pair (eg, DiffPair1_P and DiffPair1_N ).
Where is the Vaule 0 in the clearance matrix?
The row at the bottom of the Clearance rule’s minimum clearance matrix is used to define the desired clearances. Set clearance values to catch any copper objects that are too close to the edges of drill holes in the design. For the default Clearance rule, all cells for the Hole row of the matrix will have the vaule 0.
Is there a short circuit rule in Altium?
However, there is a short circuit rule you can mess around with. It’s right under Clearance. However, I am inclined to think (with the information at hand), that you’re nets are not the same (not in Altium’s eyes anyways).