To parts of an apparatus of surface acoustic wave, very sensitive to temperature. Below higher temperature, the hardness of underlay material drops easily, sound wave rate also falls accordingly. Because protective frequency band is narrower and narrower, and consume the designation of equipment working temperature range is bigger (it is normally – 20 ℃ come 85 ℃ ) , the effect of this kind of limitation is accordingly more and more serious.

 

One kind replaces a method is use temperature compensation (TC-SAW) filter, it is additional on the structure of IDT Tu Fuyi the layer lifts in temperature Shi Gang spends the coating that can strengthen. The frequency temperature coefficient that temperature did not compensate SAW parts of an apparatus (TCF) it is about normally – 45ppm/ ℃ , and TC-SAW filter falls to – 15 to – 25ppm/ ℃ . But because temperature compensates craft to need layer of double model of attack by surprise, so, TC-SAW filter more complex, production cost is relative also taller.

 

TC-SAW technology is at present more and more mature, foreign big plant has basically roll out corresponding product, many application are obtained in front of mobile phone radio frequency, and domestic craft still needs to fumble.

 

 

Common SAW basically is 2GHz the following, cropland develops the village to overcome before the I.H.P.SAW of weakness of surface acoustic wave (Incredible High Performance-SAW) . Village cropland meaning develops SAW technology acme (4GHz is the following) , the frequency that at present the quantity produces can amount to 3.5GHz.

 

 

The basic structure of graph I.H.P.SAW

 

I.H.P.SAW can come true as identical as BAW or the character of prep above BAW, hold the temperature that had BAW concurrently to come loose characteristicly, high the advantage of hot sex, specific as follows:

 

(1) tall Q value: The resonator trial-produce result on 1.9GHz frequency band shows, its Q was worth characteristic peak value to exceed 3000, than before Qmax got for 1000 right-and-left SAW substantially improvement.

 

 

(2) low TCF: It is passed at the same time control line coefficient of expansion and velocity of sound realize good temperature character. Before the TCF changeover amount of SAW is very large (it is about – 40ppm/ ℃ ) , and I.H.P.SAW can reach its improvement ±8ppm/ ℃ is the following.

 

(3) come loose high hot sex: The IDT after inputting high-power signal to RF filter can produce quantity of heat, input more high-power gives out heat possibly because of IDT and destroy electrode, cause trouble thereby. The quantity of heat that I.H.P.SAW can produce electrode sends out efficiently from substrate a side go out, can rise the temperature when electrify extent falls to before the half of SAW is the following. Low TCF and come loose high hot sex two kinds of effects, make its also can stabilize the job below high temperature.

 

 

At present the filter of body sound wave on market basically is based on technology of much brilliant film. And Akoustis Technologies of newly established company, inc. The Bulk ONE of the invention? BAW technology is to use resonator of single crystal AlN-on-SiC, can promote according to weighing function 30% .

 

 

Technology of BAW of graph monocrystalline silicon is aimed at high frequency applying

 

 

Akoustis technology company (before call Danlax, corp. ) it is according to American Nevada law holds water at was being registered on April 10, 2013, headquarters is set in north to block the Hengciweier of Luo Laina city. On April 15, 2015, company more the name is Akoustis technology company. March 2017, land Nasidake.

 

At present Akoustis had announced to roll out 3 business to use filter product: The first is to use means of Yu Sanpin WiFi by implement applied business uses filter of 5.2 GHz BAW RF; The 2nd is the filter of 3.8 GHz BAW RF that is aimed at radar application; The 3rd AKF -1652 is to be aimed at filter of 5.2 GHz BAW RF of mobile equipment of prospective 4G LTE and 5G

 

 

Of filter enclosing miniature to change basically is to show is to use brilliant round class to enclose a technology.

 

The CuFlig interconnection technology of Qorvo uses dot of cupreous column protruding to replace line solder. Brilliant round class enclosed filter to cancel pottery and porcelain to enclose, can implement measure smaller, equipment is more frivolous.

 

 

Graph CuFlip technology is opposite at line solder compare a dominant position

 

RF360 company DSSP (Die-Sized SAW Packaging, naked the watch encloses a class sound) with TFAP technology (Thin-Film Acoustic Packaging, filmy and acoustics enclose technical) , realized product miniature to change, can offer 2in1, even the filter model group of 4in1.

 

The new standard of different product category encloses dimension: Diplexer 1.8mm*1.4mm, 2in1 filter: 1.5mm*1.1mm, onefold filter: 1.1mm*0.9mm.

 

 

Filter of watch of graph RF360 sound, diplexer and multitask implement miniature is changed

 

 

Graph DSSP is enclosed graphic

 

 

The graph uses the BAW filter of TFAP technology

 

 

What international big plant devotes oneself to radio frequency front all the time is compositive change reach modular, open RF360 program high for instance; Murata the switch of filter, RF, module that matchs the unifinication such as circuit; Solution of Qorvo RF Fusion.

 

Connect POP3D design high to use advanced 3D to enclose a technology, onefold enclose inside compositive amplifier of power of odd chip much model and aerial switch (AS) , mix filter diplexer is compositive in an onefold base, next component of base park foundation over, conformity becomes a single “3D” chip group to combine, reduced integral complexity thereby, slam the door the common down-lead joint in module of front of current radio frequency.

 

 

The figure connects radio frequency POP 3D high to design CMOS front

 

Qorvo RFFusion solution includes 3 kinds of module to change a solution, realize section of music of Duan Pin of tall, medium, low frequency to be enclothed completely. Each module is compositive power amplifier (PA) , switch and filter.

 

 

The solution of 2017 RF Fusion that graph Qorvo much module comprises