Overview of the PSP model

The PSP model uses a hierarchical structure and therefore a global and local parameter set. A separation exists between the scaling rules used for the global model and the parameters of the local model. The model can be used at each of the levels.

Global Level

A global parameter set is used to model a range of geometries used in a given process. Combined with instance parameters L and W, from the global parameter set a local model will be derived and processed subsequently at the local level for each geometry.

Local Level

A local parameter set is used to simulate one discrete geometry. At this level, the temperature scaling is included.

Each of the parameters of the local parameter set can be derived from electrical measurements. Consequently, a local parameter set gives a complete description of one device for a specific geometry.

Most of these local parameters scale with geometry. A whole range of geometries used in a MOS process can therefore be described by a larger set of parameters, the global parameter set.

Hierarchical Structure of the PSP Model

Figure 49 PSP Model Hierarchy, described by global and local levels

PSP also enables you to use binning. This is achieved through an independent parameter set. A local set is derived from the binning parameters, similar to the use of the global model.