MSP-EXP432P401R_TXS0104EPWR Interface IC Guide

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.

The TI BAW oscillator is an electronic oscillator circuit that utilizes the piezoelectric effect to generate a stable electronic signal through the mechanical resonance of a vibrating miniature acoustic resonator (BAW). This precise high-frequency signal provides a clock and timing reference for electronic systems.

MSP-EXP432P401R_TXS0104EPWR Interface IC

TPS62143RGTR

TPS563209DDCR TPS563209DDCT TS3USB221RSER LM339APWR MAX3232IPWR.

TPS74801DRCR TPS22918DBVR TLV62569ADRLR TLV62569ADRLT TPS61230ARNST.

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.

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.

MSP-EXP432P401R_TXS0104EPWR Interface IC

BLM21PG300SH1D

TPS54310PWPR TPA3116D2DADR LM3429MHX/NOPB DP83867CRRGZT TPS62172DSGR.

. 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.

LM5176PWPR LM5176PWPT DRV8876PWPR TPS23751PWPR TPS61194PWPR.

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.

MSP-EXP432P401R_TXS0104EPWR Interface IC

Physically, waves are mainly divided into two types, one is electromagnetic wave, which does not require any medium, but propagates through the periodic oscillation of the electric and magnetic fields generated by the initially charged particles, so in a vacuum can also spread. Radio waves, microwaves, visible light, X-rays, and gamma rays are all electromagnetic waves.

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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