LM385M3X-1.2/NOPB_GRM55DR72E105KW01L Introduction

Every electronic system must have a heartbeat—a clock signal that helps every component run in perfect synchronization. For decades, designers have used quartz crystals to generate this electronic heartbeat.

In April 2019, Texas Instruments released the construction plan for this 300mm fab, with an estimated investment of $3.1 billion. However, in view of the sluggish semiconductor market in 2019 and the unsatisfactory revenue situation, TI's plan to invest in the construction of a 300mm wafer fab in Richardson is not as smooth as originally expected, and it may be delayed for two years to complete.

LM385M3X-1.2/NOPB_GRM55DR72E105KW01L

TPS23751PWPR

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.

TPS62823DLCR TPS62823DLCT TPS62821DLCT TPS62821DLCR BQ40Z50RSMR-R2.

TMP112AIDRLR TS3A225ERTER TPS2546RTER TMP112AIDRLT TPS82130SILR.

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.

LM385M3X-1.2/NOPB_GRM55DR72E105KW01L

BLM31PG330SH

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.

UCC28063DR LM536003QDSXRQ1 UCC2892DR MSP430FR2111IPW16R UCC21520QDWRQ1.

BQ24311DSGR TIC10024QDCPRQ1 TL331IDBVR TL331IDBVT TPS63070RNMT.

TPS630701RNMT TPS630702RNMR TPS54218RTER TPS92692PWPR TPS56C230RJER.

LM385M3X-1.2/NOPB_GRM55DR72E105KW01L

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.

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.

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