How many metals are there in cmos process?

In CMOS process, metals are usually used to make interconnection layers of circuits. In a typical CMOS process, the metal layer is usually divided into several layers, usually two or more. The function of these metal layers is to connect transistors and other electronic components in different parts to realize the connection of circuits.

Each layer of metal consists of a metal or alloy, such as aluminum (al), copper (Cu), chromium (Cr) and so on. The specific number and type of metal layers will vary according to the manufacturing process and design. Generally, modern CMOS technology may use several layers of metal to interconnect circuits, which makes the design and manufacture of complex circuits more flexible and efficient. The number and type of metal layers are usually determined by process manufacturers and design requirements.

Different metal layers will be used in CMOS process to ensure the connection between electronic components and allow the circuit to work correctly. These metal layers are usually used to make interconnections between lines and circuits.