1. In terms of process materials, there are aluminum gates and silicon gates. The former uses aluminum as the grid and aluminum as the conductor at the same time, which belongs to a relatively early process; The latter is a popular process with silicon as the gate and aluminum as the conductor.

2. From the point of view of manufacture and use, there are pmos, nmos, cmos, bjt, bicmos and so on.

These processes listed above need to be selected according to the design requirements and cost.