SN74AHCT1G14DBVR_TPS62090RGTR Introduction

Another product announced by TI is a network synchronizer based on BAW technology that works with a quartz crystal to reduce digital noise or jitter. Noise cancellation will bring many advantages to telecom systems such as 5G networks. These noise and jitter typically come from the input signals of the communications subsystems of the wired or wireless hardware infrastructure in the data center core network.

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.

SN74AHCT1G14DBVR_TPS62090RGTR

TPS613221ADBVT

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: . For the first time in the industry, TI uses this technology for integrated clock functions. • In the past, BAW resonator technology has been used to filter signals in communication technologies such as smartphones.

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.

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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SN74AHCT1G14DBVR_TPS62090RGTR

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. 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. 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.

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SN74AHCT1G14DBVR_TPS62090RGTR

The Membrane type is similar to the basic model of the BAW resonator, with air on both sides. Since the acoustic impedance of the air is much lower than that of the piezoelectric layer, most of the acoustic waves will be reflected back.

Compared with BAW-SMR, a smaller part of the membrane type is in contact with the underlying substrate, which is not easy to dissipate heat. However, the thin film structure needs to be strong enough to be unaffected by subsequent processes.

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