The type of the quantity mainly determines their field of application. The
number of values stored within a quantity depends on the application area:
- Global quantities
store only single values.
- Segment quantities store values for each grid point for a certain segment
within a certain device. The grid point is the center of the corresponding
Voronoi box (see Section 2.3.1).
A segment quantity may either be defined constant or distributed on the grid
of that segment.
- Boundary quantities store values for each point defined on the interface
between two segments. A boundary quantity may either be constant or
distributed on the grid of that boundary.
- Mixed-mode quantities store a single value for each node of the circuit.
If, however, the circuit consists of hundred nodes just one quantity is
defined containing hundred values, one for each node. This approach has been
chosen to avoid the definition of thousands of quantities even for small