coupling.hpp File Reference

Coupled segments of a differential pair, as KiCad 10.0.6's diff-pair coupling test finds them (pcbnew/drc/drc_test_provider_diff_pair_coupling.cpp, doc 05 §59): a track of the P net and one of the N net on the same layer are coupled where they run on parallel, distinct lines and their projections overlap. More...

#include <optional>
#include "model/board.hpp"

Go to the source code of this file.

Classes
struct	tmk::drc::Coupling

Namespaces
namespace	tmk
namespace	tmk::drc

Functions
std::optional< Coupling >	tmk::drc::couple (model::Point p0, model::Point p1, Coord wp, model::Point n0, model::Point n1, Coord wn)
	The two centrelines (a P track from p0 to p1 of width wp, an N track likewise) coupled as KiCad couples them, or nothing: both longer than about 1 nm, exactly parallel (a zero cross product) and not collinear, with overlapping projections.

Detailed Description

Coupled segments of a differential pair, as KiCad 10.0.6's diff-pair coupling test finds them (pcbnew/drc/drc_test_provider_diff_pair_coupling.cpp, doc 05 §59): a track of the P net and one of the N net on the same layer are coupled where they run on parallel, distinct lines and their projections overlap.

The gap is measured between the overlapping parts, edge to edge. Integer arithmetic follows KiCad's SEG (rounded rescale, truncated square root), so the gap is KiCad's to the nanometre.

Definition in file coupling.hpp.