Radio frequency parts of an apparatus: Admire the mobile phone awkwardness at the person
Of the mobile phoneRadio frequencyParts of an apparatus, be just like the radio arms of army, communication relies on it completely.
China is the world’s greatest mobile phoneProductionCountry, but the mobile telephone that cannot make high endRadio frequencyParts of an apparatus. This needs data, CraftAccumulate with the sureness that designs experience.
Radio frequency chip lacks high end home products
Of a mobile phone advocate board go up, the space of 1/3 is radio frequency circuit.
Sound should travel a long distance besides, be changed into high frequency radio wave first. Imformation encoding becomes the sine electric wave of a second of a few wave crest, mobile phone of the other side is received and reductive, grain silk is not random. This is the skill of radio frequency parts of an apparatus. The core component of radio frequency parts of an apparatus is power amplifier chip, also call radio frequency chip, 4G mobile phone can be used commonly 4 go to 5.
“We are just like build a highway, luxiude is wider, flatter, the car runs so that jump over much, faster. ” Wang Liming says the Vanchip company engineer of chip of professional design radio frequency.
“Trend of mobile phone development is more frivolous, power comsumption is smaller, frequency paragraph more, bandwidth is bigger, this posed a challenge to radio frequency chip. ” Wang Liming says, “Radio frequency chip changes digital signal into electromagnetic wave, 4G hand confidential supports ten frequency paragraph, information bandwidth a few. Signal cannot suffer interference, this is very difficult. “
2018, radio frequency chipThe market15 billion dollar; High endThe marketDo not have home products basically, be connected by Skyworks, Qorvo and rich 3 forestall, connect high also take position.
“Old since, these a fewProductHad had public praise very much, performance is very steady. So company of old mobile phone for instance apple, China to mix SamSung is waited a moment, use them basically. ” Wang Liming says.
Of home products buy the home to be essay card mobile phone more, and home products is chip of 2G, 3G more; Chip of 4G radio frequency is basic it is foreign goods.
Of radio frequency chipCircuit designBe abstruse artistic
The signal of high frequency electric wave is very flimsy, in complex electromagnetism environment, the clarity that carries signal is stable, hang on the interference rejection sex of each link. Design this kind of circuit, it is an art that has not find the pattern completely.
E.g. , imperfect radio frequency chip resembles enlarge sound speaker same, can issue cuting useless signal. The platoon checks breakdown dispute to often be bothered.
Radio frequency circuit is afraid that noise is disturbed, but the possibility that introduces noise is too much — component of power source, adjacent circuit, coupling, calorific, oneself…
UnreasonableBuild a model, ProductionThe circuit that come out, an effect day with another is fastened poorly.
And turn into from blueprint actual circuit, need the rich experience of stylist more. Why to plant layout, how to offset the bad influence of each component, compatible unfavorable component, stylist should have idea. Introduce new element, little marvelous effect, big generate new interference again. Component is used much, power comsumption is met again increase…
Is stylist considering ” should otherwise give feedback annulus series does a little resistance come amortize? ” ” whether to change line of one go to the fields to cite a base with screen noise? ” when this kind of problem, often do not have off-the-peg answer, rely on experience and trial and error. Exploring to stabilize circuit, seem to establish the egg on duck’s egg, chang Ping feels.
Radio frequency chip is belonged toImitate circuit, with processing ” 1 ” and ” 0 ” digital circuit is different. NumberCircuit designBe similar to process designing, have mature module and automation tool; And designImitate circuit, what should face is complex and sealed natural world.
Zhang Guobin of author of electronic innovation net says: “More of digital circuit domain needs market reaction rate, home has many well-done companies, but design and parts of an apparatus of manufacturing radio frequency, need all sorts of background science knowledge, experience is accumulated andMakeIt is crucial, ‘ tortuous path overtake ‘ almost impossible. “
Small filter, china go to bad
Another crucial element of radio frequency parts of an apparatus — filter, domestic and international difference is bigger. The high-end filter that the mobile phone uses, the market of a few dollars, the tycoon of parts of an apparatus of foreign radio frequency such as completely attributive Qorvo.
Filter but purify target frequency paragraph the signal beyond, be very circuit parts of an apparatus of the foundation. What 4G mobile phone uses is more essence of life allows and costly filter, confidential of a hand is installed 10 come. Filter of this kind of high end is based on piezoelectric effect principle, introduce sound wave to work; Its base and coating use a few new data (wh some of which is used on radar of best for military use) , treatment precision wants very tall, involveFilmyDeposit and smallMechanicalCraft.
Duan Bian predestined relationship jumps over filter frequency ” abrupt ” , can avoid adjacent frequency more paragraph signal interference. “Take a filter to resemble a door for instance, high endProductdoorcase is OK and very good, get hash filter very clean. ” Zhang Guobin says, “Central frequency is like on function index, end the respect such as frequency, degree of linearity, sensitivity we are more backward than others, still cannot catch up with temporarily. “
Foundation yuan the difference of parts of an apparatus is more than this one. Zhang Guobin cited a case: Radio frequency circuit has an oscillator, it needs oscillator of crystal of a high accuracy, high frequency signal needs times frequency signal, if the frequency precision of crystal oscillator is insufficient, criterion for many times the times signal after adding can be differred cannot use. And most the crystal oscillator with accurate essence, majority is produced from abroad.
Material is to circle the bank that goes nevertheless
All high-end component, concern with high-powered data.
Zhang Guobin says, radio frequency circuit needs tall electron mobility, it is a lot of better that this respect arsenic changes the compound semiconductor expression such as gallium and silicon germanium to want to compare silicon data. Although our country is in,go up 60 time began the century compound semiconductor foundationMaterial research and development, but commercialize on uniformity of function of the consistency of material, report is not ideal still, this respect has knowledge of a lot of core to need his to fumble, be us is short board.
“The impure scale of semiconductor material is for instance different, function difference is very big. Seem to do cake to put an egg, the scale of the egg decides cake is loose degree. How much should put? Others does not tell you. You are impossible also with try luck to succeed. “
Zhang Guobin says, the experiment of semiconductor material, cycle is very long, either can make success 9 years. “Our country has many schools to be in in this respect research, do well also, but some data capacity is produced change still be no good. “
Additional, parts of an apparatus of high-end radio frequency uses new data, also need an architect familiar and corresponding special technology andEnclose. Without the craft of innovation, although use new data, Fine is tasted rateAlso can differ more.
Accordingly, of homeRadio frequency chip is designedThe company is to searchActing factory. And the brilliant round plant that a few tycoons of foreign have him, won’t take special secret to the factory of others. (reporter tall rich)