Definisi high-frequency PCB board

Papan frekuensi dhuwur nuduhake papan sirkuit frekuensi elektromagnetik khusus, digunakake kanthi frekuensi dhuwur (luwih saka 300 frekuensi MHZ utawa dawa gelombang kurang saka 1 meter) lan gelombang mikro (luwih saka 3 frekuensi GHZ utawa dawa gelombang kurang saka 0.1 meter) ing lapangan PCB, ana ing wadhah tembaga pangkal gelombang mikro kanthi nggunakake metode manufaktur papan sirkuit kaku umum saka bagean proses utawa panggunaan metode pamroses khusus lan produksi papan sirkuit. Umumé, papan frekuensi dhuwur bisa ditetepake minangka papan sirkuit kanthi frekuensi ing ndhuwur 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. Contone, bahan substrat kudu nduweni sifat listrik sing apik, stabilitas kimia sing apik, kanthi nambah frekuensi sinyal daya ing syarat-syarat rugi substrat cilik banget, mula pentinge plat frekuensi dhuwur disorot.

Classification of PCB high frequency plate

1, at the end of the ceramic filled thermosetting material

Cara pangolahan:

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. Bahan PTFE (polytetrafluoroethylene)

Cara pangolahan:

1. Pembukaan bahan: film proteksi kudu disimpen kanggo nyegah goresan lan lekukan

2. latihan:

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

2.2 Lembar aluminium minangka piring tutup, banjur gunakake piring amina kandhel 1mm, kencengake piring PTFE

2.3 Lebokake bledug saka bolongan nganggo bedhil udara sawise ngebur

2.4 Kanthi rig pengeboran sing paling stabil, paramèter pengeboran (pokoke, bolongane luwih cilik, laju pengeboran luwih cepet, beban Chip sing luwih cilik, tingkat bali sing luwih cilik)

3. Pangolahan bolongan

Pangobatan plasma utawa perawatan aktivasi natrium – naphthalene migunani kanggo metallization pori-pori

4. tembaga sink PTH

4.1 Sawise mikro-etsa (laju etching mikro wis dikendhaleni 20 mikro-inci), piring kasebut diwenehi minyak saka silinder sing ngilangi minyak nalika narik 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:

Apa papan frekuensi dhuwur PCB? Klasifikasi plate frekuensi dhuwur PCB

Bahan lembaran frekuensi dhuwur lan kacepetan dhuwur

Nalika milih substrat kanggo PCB kanggo sirkuit frekuensi dhuwur, kudu dipikirake khusus kanggo karakteristik variasi bahan DK kanthi frekuensi sing beda. 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. Apamaneh ing kisaran frekuensi saka L MHz nganti L GHz, nilai DK lan DF bakal luwih jelas. 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. Ndhuwur lGHz, nilai DK bakal diowahi alon-alon. 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.

Faktor kerugian dielektrik (DF) saka bahan substrat umum luwih gedhe tinimbang DK amarga pengaruh variasi frekuensi (utamane ing kisaran frekuensi dhuwur). Mula, nalika ngevaluasi karakteristik frekuensi dhuwur bahan substrat, kita kudu fokus marang pangowahan nilai DF. Bahan-bahan landasan kanthi kecepatan dhuwur lan karakteristik frekuensi dhuwur temenan beda karo bahan substrat umum ing babagan karakteristik variasi kanthi frekuensi dhuwur. Salah sijine yaiku kanthi pangowahan frekuensi, regane (DF) bakal owah sithik banget. Sing liyane padha karo bahan substrat umum ing kisaran variasi, nanging regane dhewe (DF) luwih murah.

How to choose high frequency high speed plate

Pilihan dewan PCB kudu nyukupi persyaratan desain, produksi massal lan biaya saldo. 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.

Apa papan frekuensi dhuwur PCB? Klasifikasi plate frekuensi dhuwur PCB

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. Integritas sinyal digital lan tajem ing sisih ndhuwur lan ngisor padha karo kurang transmisi lan transmisi distorsi kurang saka microwave RF (bagean harmoni frekuensi dhuwur saka sinyal digital tekan pita gelombang mikro). Therefore, in many respects, the PCB material selection of high-speed digital circuits is similar to the requirements of RF microwave circuits.

Apa papan frekuensi dhuwur PCB? Klasifikasi plate frekuensi dhuwur PCB

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. Ngerti sifat listrik, sifat termal, reliabilitas lsp. And rational use of stacking, design a piece of high reliability, good processing products, various factors to consider the best.

Ing ngisor iki bakal ngenalake faktor utama sing kudu dipikirake kanggo milih piring sing cocog:

1, pabrik:

Kayata macem-macem kinerja, kinerja suhu, CAF / resistensi panas lan ketahanan mekanik (viskositas) (keandalan sing apik), rating geni;

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

Kerugian sithik, paramèter Dk / Df stabil, dispersi sithik, koefisien pangowahan cilik kanthi frekuensi lan lingkungan, toleransi cilik kekandelan materi lan isi karet (kontrol impedansi sing apik), yen kawat dawa, waca foil tembaga sing kurang kasar. In addition, simulation is needed in the early stage of high-speed circuit design, and simulation results are the reference standard for design. “Teknologi Xingsen – Agilent (frekuensi dhuwur / frekuensi RADIO) Laboratorium gabungan” ngrampungake masalah kinerja asil simulasi lan tes sing ora konsisten, lan nindakake simulasi lan verifikasi loop tertutup tes nyata, liwat metode unik kanggo nggayuh konsistensi simulasi lan pangukuran.

Apa papan frekuensi dhuwur PCB? Klasifikasi plate frekuensi dhuwur PCB

3. Kasedhiya bahan sing tepat wektu:

Akeh siklus pengadaan piring frekuensi dhuwur banget, sanajan 2-3 wulan; 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. Faktor biaya:

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.

Supaya kompatibel karo peraturan lingkungan ing macem-macem negara lan memenuhi persyaratan RoHS lan bebas halogen.

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. Plat sirkuit kanthi kerugian medium lan kurang bakal cocog karo sirkuit digital 10Gb / S; The plate with lower loss is suitable for 25Gb/s digital circuit; Panel kanthi kerugian ultra-low bakal nampung sirkuit digital kanthi kecepatan luwih cepet kanthi tarif 50Gb / s utawa luwih dhuwur.

From the material Df:

Df ing antarane 0.01 ~ 0.005 papan sirkuit sing cocog kanggo watesan ndhuwur sirkuit digital 10Gb / S;

Df ing antarane 0.005 ~ 0.003 papan sirkuit sing cocog kanggo watesan ndhuwur sirkuit digital 25Gb / S;

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, lsp

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

3), Panasonic: Megtron4, Megtron6, lsp

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

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

6), Dongguan Shengyi, Taizhou Wangling, gelombang mikro Taixing, lsp