The manufacturing process of the chip is often represented by 90nm, 65nm, 40nm, 28nm, 22nm, 14nm. Today's cpus are integrated in hundreds of millions of transistors, which are composed of a source, a drain and a gate between them, from which the current flows into the drain, and the gate plays a role in controlling current interruption.
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The so-called number of nm actually refers to the width of the gate of the complementary oxide-metal semiconductor field-effect transistor formed on the CPU, also known as the gate length.