TPA3118D2DAPR_PCM1754DBQR Introduction

Texas Instruments (TI) said it will close its last two 150mm (6-inch) wafer fabs in the next few years while building its next 300mm (12-inch) fab at its Richardson, Texas, fab. "This will be a multi-year program that is expected to be completed no later than 2023 to 2025," Dave Pahl, head of investor relations at Texas Instruments, said on the conference call.

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.

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"Quartz crystals require additional components to extend their accuracy -- over time -- as their performance changes beyond controllable temperature changes," he added. In addition, Solis said, "using a BAW resonator is more efficient than using a quartz crystal. precise.

Ray Upton, TI's vice president of connected microcontrollers, explained that new technologies are critical to "moving large amounts of data in a stable manner," improving high-performance communications. .

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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. 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 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.

TPA3118D2DAPR_PCM1754DBQR

The BAW filter is more suitable for frequencies above 2.5GHz. The manufacturing process of the BAW filter is also very consistent with the existing IC manufacturing process, and is suitable for overall integration with other active circuits. .

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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