AD1580BKSZ-REEL7_AD1988BJCPZ-03J Introduction

Texas Instruments currently has 15 wafer fabs in 9 countries, of course, these plants include outdated capacity that is about to close, as well as new 300mm capacity. In April 2019, Diodes completed the acquisition of Texas Instruments' 150mm/200mm wafer fab (GFAB) in Greenock, Scotland, UK, as part of TI's strategy to gradually abandon outdated capacity.

A world-leading computer science program called Immersive Software Engineering (ISE) has been launched in partnership with the University of Limerick (UL) and leading companies including Stripe, a technology leader in economic infrastructure.

AD1580BKSZ-REEL7_AD1988BJCPZ-03J

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Analog Devices leverages its unique domain application expertise to play an important role in end-use applications and positively impact customers' businesses. ADI's advances in software are deeply influencing how customers choose and use their solutions. .

. A cohort of students is expected to enroll in ISE courses in September 2022. Through industry placements, students gain experience working in companies (which make up nearly half of the total coursework), allowing them to acquire the skills they need in a real work environment under the guidance of a mentor.

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.

So, does this mean that 150mm wafers are gradually withdrawing from the stage of history? The answer is no, there is still a huge market space for 150mm wafers. A large number of 150mm fabs in the industry were closed, and more and more 300mm fabs were launched and gradually achieved mass production.

AD1580BKSZ-REEL7_AD1988BJCPZ-03J

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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. 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 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. .

As part of the research initiation part of the UL initiative, ADI will fund experimental development and research with a view to developing new software processes and services. . In the context of the increasing global demand for development talents and the rapid growth of the Internet economy, ISE aims to transform the way computer science is taught and cultivate industry-experienced software professionals to have a greater impact on the business.

"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.

"TI has been involved in MEMS for years. When asked why no one in the industry has built something like a BAW resonator, Upton said, "It's very difficult to develop. However, converting electrical energy into mechanical acoustics while keeping the signal stable and robust within a clean clock is not easy.

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The working principle is as shown below. The typical basic structure is shown in the figure (a) above, with the piezoelectric layer sandwiched between the upper and lower metal electrodes, the corresponding mBVD equivalent circuit is shown in the figure (b) above, and the corresponding impedance is shown in the figure (c) above. It can be seen that there are two resonance frequencies, series (fs) and parallel (fp).

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.

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