min_length

Bounding-box length (the long side of a merged region’s axis-aligned bounding box) must be at least value. The dual of min_dim.

Semantics

For each merged region on the rule’s layer, take its axis-aligned bounding box (x0, y0)-(x1, y1) and compute length = max(x1 - x0, y1 - y0). A region whose length is below value is a violation.

Typical use: bounding the emitter stripe length of a bipolar transistor, where a companion max_length rule bounds the same dimension from above and a min_dim/max_dim pair independently bounds the stripe’s width.

Layers

A single layer, layers[0].

Parameters

None — only value (µm).

Violation markers

One point marker per offending merged region, at its centroid (owned by the tile whose core contains that centroid).

KLayout equivalent

Not a single built-in KLayout Region operator — a bounding-box measurement, analogous to filtering on Region#extents.width/.height (whichever is larger) in a KLayout DRC script.

Example

- id: npn13G2.a
  check: min_length
  layers: [EmitG2]
  value: 0.90