LM339PWR Voltage Comparator_DLW5BSM801TQ2L Guide

TI has been steadily ramping up its production of analog chips on 300mm wafers in recent years to cut costs and increase productivity. TI said the 300mm fab yields 40% cheaper chips than the 200mm process used by competitors. Also, for analog use, the ROI of a 300mm fab is likely to be higher because it can last 20 to 30 years.

"The clocking requirements for future communications infrastructures will far exceed the device performance of current quartz crystal resonators," said Kim Wong, vice president and general manager of the High Speed Data and Clocking Group at TI. By integrating TI BAW resonators directly into clocking equipment, we can achieve ultra-low jitter performance and resiliency to meet the increasingly stringent requirements for vibration and shock resistance of data pipes during the transformation of communications.

LM339PWR Voltage Comparator_DLW5BSM801TQ2L

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A large number of 150mm fabs in the industry were closed, and more and more 300mm fabs were launched and gradually achieved mass production. 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.

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LM339PWR Voltage Comparator_DLW5BSM801TQ2L

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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. 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.

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

LM339PWR Voltage Comparator_DLW5BSM801TQ2L

?? There is also a method called FBAR (Film Bulk Acoustic Resonator), including Membrane type and Airgap type. ??Membrane Type is etched from the back of the substrate to the surface (that is, the bottom electrode surface) to form a suspended thin film and a cavity. .

There are also different structures where sound waves propagate as transverse waves. In the above-mentioned BAW-SMR and FBAR?filter diagrams, sound waves propagate in the form of longitudinal waves, that is, the direction of particle vibration and the direction of wave propagation are parallel.

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