DRV8801PWPR_DRV8846RGER 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. .

With the advent of 5G networks and next-generation communications technology, many sectors from business to healthcare, agriculture and education will be affected. ?? Once the communications infrastructure is in place to support the transfer of large amounts of data, businesses and governments will want to provide wireless coverage for point-to-point connections in the last mile, from objects communicating with each other in warehouses to communicating smartphones, thermostats, heart rate between monitors and many other devices.

DRV8801PWPR_DRV8846RGER

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The most 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.

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Texas Instruments has unveiled what the company calls "breakthrough" bulk acoustic wave (BAW) resonator technology. This enables TI to introduce the industry's first crystalless wireless MCU for the embedded market, the SimpleLink CC2652RB, with the clock contained in the same chip. At just 100 microns in size, these tiny timers are smaller than the diameter of a human hair, but they operate at much higher frequencies than quartz crystals, enabling the integration of high-precision and ultra-low jitter clocks directly into packages that contain other circuitry, TI say.

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When asked why nobody in the industry has built something like a BAW resonator, Upton said, "It's very difficult to develop. But it's not easy to convert electrical energy into mechanical acoustics while keeping the signal stable and robust within a clean clock." TI has been involved in MEMS research for many years.

The technology, which also enables high-precision and robust communication between IoT devices, can now be developed in a less bulky form, said Kim Wong, vice president of high-speed data and clocking at TI.

The overall effect of this structure is equivalent to contact with air, and most of the sound waves are reflected back. This structure is called BAW-SMR (Solidly Mounted Resonator), as shown below. The reflector consists of several layers of alternating high and low impedance layers. For example, the first layer has a large acoustic wave impedance, the second layer has a small acoustic wave impedance, and the third layer has a large acoustic wave impedance, and the thickness of each layer is λ/4 of the acoustic wave, so that most of the wave will be reflected back and superimposed with the original wave. One way is to form a Bragg reflector under the oscillating structure to reflect sound waves into the piezoelectric layer.

DRV8801PWPR_DRV8846RGER

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

”. Ray Upton, vice president of TI’s Interconnect Microcontroller Group, said: “The ability to make accurate, informed decisions through the use and analysis of large amounts of data is a very important innovation capability. Wireless networks are at the heart of this data migration, and the ability to connect the last mile through connected devices is a critical part of the data loop.

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