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The continuous growth of mobile phone production is driving the demand for HDI boards. China plays an important role in the world's mobile phone manufacturing industry. Since Motorola fully adopted HDI boards to manufacture mobile phones in 2002, more than 90% of mobile phone motherboards have adopted HDI boards. A research report released by market research company In-Stat in 2006 predicted that in the next five years, global mobile phone production will continue to grow at a rate of about 15%. By 2011, global mobile phone sales will reach 2 billion units.

Components: products that do not change the molecular composition of raw materials during processing can be called components.

When designing a four-layer PCB circuit board, how is the stack-up generally designed?

The semiconductor industry is a high-tech industry that involves the research and development, manufacturing, and application of semiconductor materials. Semiconductors are a special type of material with conductive properties that lie between conductors and insulators. Semiconductor materials achieve the functionality of electronic devices by controlling the flow of current.

The semiconductor industry originated in the late 20th century and has become one of the most important parts of the global economy. Nowadays, almost every electronic device has semiconductors

The concept of integrated circuits traces its roots back to the late 1950s and early 1960s. Jack Kilby, an engineer at Texas Instruments, and Robert Noyce, co-founder of Fairchild Semiconductor and later Intel, independently conceived the idea of integrating multiple electronic components onto a single semiconductor substrate.