How is a microprocessor made?
Microprocessors are built in layers on a silicon wafer through various processes using chemicals, gases and light. Making microprocessors is a complex, demanding process involving more than 300 steps. There are roughly 20 layers that are connected to form microprocessor circuitry in a three-dimensional structure. The exact number of layers on a wafer depends on the design of the microprocessor. Hundreds of identical microprocessors are created in batches on a single silicon wafer. On the wafer, the microscopic circuitry of each and every microprocessor is tested. Then, the wafer is cut with a diamond saw, separating the microprocessors. Each processor is then inserted in a protective package that allows it to connect with other devices. The type of package depends on the type of microprocessor and how it will be used. Each packaged microprocessor is tested one more time, completing the last step in the chip-making process.
