Definisyon high-frequency PCB board

Segondè frekans tablo refere a espesyal frekans elektwomayetik sikwi tablo a, yo itilize nan frekans segondè (pi gran pase frekans 300 MHZ oswa longèdonn se mwens pase 1 mèt) ak mikwo ond (pi gran pase 3 GHZ frekans oswa longèdonn se mwens pase 0.1 mèt) nan jaden an nan PCB, se sou baz la mikwo ond kwiv rekouvèr lè l sèvi avèk komen rijid sikwi metòd fabrikasyon tablo nan yon pati nan pwosesis la oswa itilize nan metòd pwosesis espesyal ak pwodiksyon an nan tablo sikwi. An jeneral, tablo segondè-frekans yo ka defini kòm tablo sikwi ak frekans ki pi wo a 1GHz.

With the rapid development of science and technology, more and more equipment design is in the microwave band (> 1GHZ) and even with the millimeter wave field (30GHZ) above the application, which also means that the frequency is higher and higher, the substrate of the circuit board requirements are also higher and higher. Pou egzanp, materyèl substra bezwen gen ekselan pwopriyete elektrik, bon estabilite chimik, ak ogmantasyon nan frekans siyal pouvwa nan kondisyon yo ki pèt substra yo piti anpil, se konsa enpòtans ki genyen nan plak frekans segondè make.

Classification of PCB high frequency plate

1, at the end of the ceramic filled thermosetting material

Otomatik metòd:

And epoxy resin/glass woven cloth (FR4) similar processing process, but the plate is more brittle, easy to break, drilling and gong plate drill nozzle and gong knife life is reduced by 20%.

2. PTFE (polytetrafluoroetilèn) materyèl

Otomatik metòd:

1. Ouvèti materyèl: fim pwoteksyon dwe kenbe pou anpeche reyur ak endentasyon

2. Egzèsis la:

2.1 use a new drill (standard 130), one piece stacked is the best, the presser foot pressure is 40psi

2.2 Fèy aliminyòm kòm plak kouvèti, Lè sa a, sèvi ak 1mm dans plak amine, sere boulon plak la PTFE

2.3 Kònen pousyè a soti nan twou a ak zam lè apre perçage

2.4 Avèk aparèy la perçage ki pi estab, paramèt perçage (fondamantalman, ki pi piti a twou a, pi vit nan to a perçage, ki pi piti a chaj Chip, ki pi piti a pousantaj la retounen)

3. Pwosesis la twou

Tretman Plasma oswa sodyòm – tretman activation naphthalene se benefisye metalizasyon nan porositë

4. PTH koule kwiv

4.1 Apre mikwo-grave (pousantaj la mikwo-grave te kontwole pa 20 mikwo-pous), se plak la manje soti nan lwil la retire silenn nan rale PTH

4.2 If necessary, go through the second PTH, just from the forecast? The cylinder began to enter the plate

5. The resistance welding

5.1 Pre-treatment: use acid washing plate instead of mechanical grinding plate

5.2 After pre-treatment, bake plate (90℃, 30min), brush green oil and cure

5.3 Three baking plates: one is 80℃, 100℃ and 150℃ for 30min each (if oil is found on the substrate surface, it can be reworked: wash off the green oil and reactivate it)

6. Gong board

Lay the white paper on the PTFE board circuit surface, and clamp it with fr-4 base plate or phenolic base plate with a thickness of 1.0mm and copper removal: As shown in the figure:

Ki tablo PCB frekans segondè yo? Klasifikasyon PCB segondè frekans

Segondè frekans ak gwo vitès fèy materyèl

Lè w ap chwazi substra a pou PCB pou sikwi frekans segondè, yo ta dwe bay konsiderasyon espesyal karakteristik varyasyon nan materyèl PK nan frekans diferan. For the requirements of signal high-speed transmission or characteristic impedance control, DF and its performance under the conditions of frequency, temperature and humidity are mainly investigated.

Under the condition of frequency variation, the DK and DF values of general substrate materials change greatly. Espesyalman nan seri a frekans soti nan L Megaèrts L GHz, DK yo ak valè DF chanje plis evidamman. For example, the GENERAL epoxy – glass fiber substrate material (general FR-4) has a DK value of 4.7 at lMHz and a DK value of 4.19 at lGHz. Pi wo pase lGHz, valè DK li yo chanje dousman. For example, under l0GHz, the DK value of FR-4 is 4.15. For substrate materials with high speed and high frequency characteristics, the DK value changes slightly. From lMHz to lGHz, the DK value mostly stays within 0.02 range. The DK value tends to decrease slightly at different frequencies from low to high.

Faktè pèt Dielectric (DF) nan materyèl la substra jeneral se pi gwo pase sa yo ki nan DK akòz enfliyans nan varyasyon frekans (espesyalman nan seri a frekans segondè). Se poutèt sa, lè evalye karakteristik sa yo frekans segondè nan yon materyèl substra, nou ta dwe konsantre sou chanjman nan valè DF li yo. Materyèl yo substra ak vitès segondè ak karakteristik frekans segondè yo evidamman diferan de materyèl yo substra jeneral an tèm de karakteristik sa yo varyasyon nan frekans segondè. Youn nan se ke ak chanjman nan frekans, valè li yo (DF) chanje anpil. Lòt la se menm jan ak materyèl la substra jeneral nan seri a nan varyasyon, men pwòp li yo (DF) valè ki pi ba.

How to choose high frequency high speed plate

Seleksyon tablo PCB yo dwe ranpli kondisyon konsepsyon yo, pwodiksyon an mas ak pri nan balans ki genyen ant. In short, the design requirements consist of two components: electrical and structural reliability. This is usually important when designing very high speed PCB boards (frequencies greater than GHz). For example, the fr-4 material commonly used today may not be applicable due to its large Df (Dielectricloss) at several GHz frequencies.

Ki tablo PCB frekans segondè yo? Klasifikasyon PCB segondè frekans

For example, a 10Gb/S high-speed digital signal is a square wave, which can be regarded as a superposition of sinusoidal signals of different frequencies. Therefore, 10Gb/S contains many different frequency signals: 5Ghz fundamental signal, 3 order 15GHz, 5 order 25GHz, 7 order 35GHz signal, etc. Entegrite nan siyal dijital la ak apik la nan bor yo anwo ak pi ba yo se menm bagay la tou kòm pèt la ki ba ak transmisyon deformation ki ba nan mikwo ond RF (pati nan frekans segondè Harmony nan siyal la dijital rive nan bann mikwo ond lan). Therefore, in many respects, the PCB material selection of high-speed digital circuits is similar to the requirements of RF microwave circuits.

Ki tablo PCB frekans segondè yo? Klasifikasyon PCB segondè frekans

In practical engineering operations, the selection of high-frequency plates seems simple, but there are still many factors to be considered. Through the introduction of this paper, AS a PCB design engineer or a high-speed project leader, I have a certain understanding of the characteristics and selection of plates. Konprann pwopriyete elektrik, pwopriyete tèmik, fyab, elatriye. And rational use of stacking, design a piece of high reliability, good processing products, various factors to consider the best.

Sa ki anba la yo pral prezante faktè prensipal yo konsidere nan chwazi plak ki apwopriye a:

1, fabrikabilite:

Tankou miltip pèfòmans peze, pèfòmans tanperati, CAF / rezistans chalè ak severite mekanik (viskozite) (bon fyab), Rating dife;

2, with the product matching performance (electrical, performance stability, etc.) :

Pèt ki ba, ki estab paramèt Dk / Df, ki ba dispèsyon, ti koyefisyan chanjman ak frekans ak anviwònman, ti tolerans nan epesè materyèl ak kontni kawotchou (bon kontwòl enpedans), si fil la se long, konsidere ba brutality FOIL kòb kwiv mete. In addition, simulation is needed in the early stage of high-speed circuit design, and simulation results are the reference standard for design. “Xingsen Teknoloji – Agilent (gwo vitès / frekans radyo) Joint laboratwa” rezoud pwoblèm nan pèfòmans nan rezilta simulation konsistan ak tès yo, li fè yon gwo kantite simulation ak tès aktyèl fèmen-bouk verifikasyon, atravè yon metòd inik reyalize konsistans nan simulation ak mezi.

Ki tablo PCB frekans segondè yo? Klasifikasyon PCB segondè frekans

3. Disponibilite alè nan materyèl:

Anpil sik segondè-frekans akizisyon plak trè long, menm 2-3 mwa; In addition to the conventional high frequency plate RO4350 has inventory, many high frequency plates need to be provided by customers. Therefore, high frequency plate and manufacturers need to communicate well in advance, as soon as possible;

4. Faktè pri:

Depending on the price sensitivity of the product, whether it is a consumer product, or a telecommunications, medical, industrial, military application;

5. Applicability of laws and regulations, etc.

Pou ou kapab konpatib ak règleman anviwònman an nan diferan peyi ak satisfè kondisyon ki nan RoHS ak alojene-gratis.

Among the above factors, the running speed of high-speed digital circuit is the main factor to consider in PCB selection. The higher the circuit speed, the smaller the selected PCBDf value should be. Plak sikwi a ak pèt mwayen ak ba yo pral apwopriye pou 10Gb / S sikwi dijital; The plate with lower loss is suitable for 25Gb/s digital circuit; Panno ak pèt ultra-ba pral akomode pi vit, gwo vitès sikwi dijital nan pousantaj de 50 GB / s oswa pi wo.

From the material Df:

Df ant 0.01 ~ 0.005 tablo sikwi apwopriye pou limit la anwo nan 10Gb / S sikwi dijital;

Df ant 0.005 ~ 0.003 tablo sikwi apwopriye pou limit la anwo nan 25Gb / S sikwi dijital;

Circuit boards with Df not more than 0.0015 are suitable for 50Gb/S or higher speed digital circuits.

Commonly used high-speed plates are:

1), Rogers: RO4003, RO3003, RO4350, RO5880, elatriye

2), Taiyao TUC: Tuc862, 872SLK, 883, 933, elatriye

3), Panasonic: Megtron4, Megtron6, elatriye

4), Isola: FR408HR, IS620, IS680, elatriye

5) Nelco: N4000-13, N4000-13EPSI, elatriye

6), Dongguan Shengyi, Taizhou Wangling, Taixing mikwo ond, elatriye