AD1173_AD1981BJSTZ Introduction

Among them, 42 150mm fabs and 24 200mm fabs were closed, while the number of closed 300mm fabs accounted for only 10% of the total. . The details are shown in the figure below. According to IC Insights statistics, in the past 10 years (2009-2018), all 11-ball semiconductor manufacturers closed or rebuilt a total of 97 fabs.

But in fact, the global semiconductor market has an annual scale of US$470 billion, including four categories of digital chips (US$330 billion), analog chips (US$58.8 billion), sensors and discrete devices. When everyone pays attention to the domestic substitution strategy of semiconductors after dinner, they often equate semiconductors with digital integrated circuits represented by CPUs.

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Stop pins turn off all switches to reduce EMI or ripple and minimize distortion passed to precision signal chains, measurements, sensors or wireless connected components. The mode pin allows continuous conduction mode (also known as forced pulse width modulation mode) to improve ripple or noise performance and reduce the impact on transmission in sensitive RF applications. .

The basic structure of the BAW filter is that two metal electrodes sandwich a piezoelectric film (the thickness of the Quartz substrate is 2um at 2GHz), and the acoustic wave oscillates in the piezoelectric film to form a standing wave.

For the first time in the industry, TI uses this technology for integrated clock functions. In order to gain an in-depth understanding of TI's new breakthrough in BAW technology, let's start with the principle of BAW filter: . • In the past, BAW resonator technology has been used to filter signals in communication technologies such as smartphones.

In addition, Solis says, "using a BAW resonator is more accurate than using a quartz crystal." Quartz crystals require additional components to extend their accuracy -- over time -- as their performance changes beyond controllable temperature changes, he adds Say.

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"The new BAW resonator technology is important because TI is integrating it into its silicon products, reducing design time, solution size and component cost," said Philip Solis, research director for connectivity and smartphone semiconductors at IDC.

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The propagation speed of sound waves in solids is ~5000m/s, which means that the acoustic impedance of solids is about 105 times that of air, so 99.995% of the sound wave energy will be reflected back at the boundary between the solid and the air, which is the same as the original wave (incident wave). together to form a standing wave. In order to keep the acoustic wave in the piezoelectric film to oscillate, there must be sufficient isolation between the oscillating structure and the external environment to obtain a small loss and a large Q value. On the other side of the oscillating structure, the acoustic impedance of the piezoelectric material is not much different from that of other substrates (such as Si), so the piezoelectric layer cannot be deposited directly on the Si substrate. .

In short, advances in BAW technology have brought "higher performance, simpler design, lower cost and smaller size" to wired and wireless networks, Wong explained.

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Only the ladder type and lattice type are briefly introduced here. The BAW filter can connect multiple resonators according to a certain topology. There are many types of BAW filters, including ladder type filter, lattice type filter, stacked crystal filter and coupled resonator filter.

The particles in the solid vibrate in an elliptical trajectory, and the long axis of the ellipse is perpendicular to the surface of the solid. . For SAW, also called Rayleighsurface wave, there are both longitudinal waves and transverse waves.

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