Via Annular Ring

Check the annular ring, the distance between pad and HOLE size.

  • Target Layer Definition: Define target layer.
    • All Layers: All layers including inner layers will be target layers.
    • Top and Bottom: Top and bottom layers will be target layers.
  • Checking
    • Item: Specify the item name.
    • Via Type: Select via type..
    • Minimum Hole Size: Set the target via minimum HOLE size.
    • Maximum Hole Size: Set the target via maximum HOLE size.
    • Check Type: You can define checking type between Thickness and Ratio.
      • Thickness: Use the target via annual rings minimum size in checking.
      • Ratio: Use the target via minimum annular ring ratio in checking.
        Figure 1.


    • Value: Set the target thickness or ratio value of annual ring.
    • Remainder: For vias, not defined in the table, you can check as following option conditions.
      • Minimum Annual Ring Thickness: Set the target via annual rings minimum size in checking.
      • Minimum Size Ratio (Thickness x 100 / Pad): Set the target via minimum annular ring ratio in checking.
    • Except Via without PAD on same layer: Option to exclude a via without the Pad is placed on a component Pad from checking.
    • Non-functional inner layer Pads: Verification of presence of non-functional pad (Pad not connected to pattern or plane in inner layer) in inner layer. If non-functional Pad exists, it is fail.
      • Target Via Type: Select the target via type.
        • Through Hole Via
        • Blind Via
        • Buried Via
      • Exclude checking for specific Padstacks: Through String Filter, specific Padstacks are excluded from verification.
      • Exclude checking for outer layer Pads: The outer layer pad (Start Layer Pad, End Layer Pad of Via) of the via is excluded from verification.
        • Blind Via
        • Buried Via