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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 crystal oscillation, precise rhythm is achieved. But when these expensive crystals wear out, they can vibrate or jump, affecting the accuracy of timekeeping.

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In this case, BAW resonator technology offers TI a huge advantage by eliminating the need for external components mounted on the PCB. Today, timing often requires a quartz crystal. "Everyone uses quartz crystals for clocks," Solis said.

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.

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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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. 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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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. .

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). The working principle is as shown below.

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