With the progress of electronic technology, the complexity of PCB (tejede Circuit ọkọ), ipari ti ohun elo ni idagbasoke iyara. Designers engaged in HF PCB must have relevant basic theoretical knowledge and rich experience in THE manufacture of HF PCB. In other words, both schematic drawing and PCB design should be considered from the high-frequency working environment, so as to design a more ideal PCB.

Iwe yii, wiwu PCB, awo alurinmorin ati lo ọna apẹrẹ ti idẹ, ni akọkọ, lori ipilẹ ti wiwa PCB, okun waya, okun agbara ati awọn ibeere wiwa ilẹ ni irisi iwe ṣafihan apẹrẹ ti PCB relays, keji lati paadi isopọ ati iho, iwọn paadi PCB ati apẹrẹ ti apẹrẹ ni apẹrẹ ti boṣewa, awọn ibeere ti awọn paadi ilana iṣelọpọ PCB ni a ṣe afihan apẹrẹ ti PCB solder, Finally, from the PCB copper coating skills and Settings introduced the PCB copper coating design, specific follow xiaobian to understand.

Alaye ni kikun ti ọna apẹrẹ ti wiwa PCB, paadi alurinmorin ati wiwa epo

PCB wiring design

Waya jẹ ibeere gbogbogbo ti apẹrẹ PCB hf ti o da lori ipilẹ ti o peye. Cabling includes automatic cabling and manual cabling. Nigbagbogbo, laibikita bawo awọn laini ifihan agbara bọtini ti o wa, wiwa wiwọ yẹ ki o ṣe fun awọn laini ifihan akọkọ. Lẹhin ti pari wiwu, wiwa ti awọn laini ifihan wọnyi yẹ ki o ṣayẹwo daradara ati ṣatunṣe lẹhin ti o ti kọja ayẹwo, lẹhinna awọn kebulu miiran yẹ ki o firanṣẹ laifọwọyi. Iyẹn ni, apapọ ti Afowoyi ati wiwakọ adaṣe ni a lo lati pari wiwọ PCB.

The following aspects should be paid special attention to during the wiring of hf PCB.

1. Awọn itọsọna ti onirin

The wiring of the circuit is best to adopt a full straight line according to the direction of the signal, and 45° broken line or arc curve can be used to complete the turning point, so as to reduce the external emission and mutual coupling of high-frequency signals. Waya ti awọn kebulu ifihan agbara igbohunsafẹfẹ giga yẹ ki o kuru bi o ti ṣee. Gẹgẹbi igbohunsafẹfẹ iṣiṣẹ ti Circuit, ipari ti laini ifihan yẹ ki o yan ni idiwọn, nitorinaa lati dinku awọn iwọn pinpin ati dinku isonu ti ifihan. Nigbati o ba n ṣe awọn panẹli ilọpo meji, o dara julọ lati ṣe ipa ọna awọn fẹlẹfẹlẹ meji ti o wa nitosi ni inaro, diagonal tabi tẹ lati laja ara wọn. Yago fun ni afiwera si ara wọn, eyiti o dinku kikọlu ara ati idapọ parasitic.

Awọn laini ifihan agbara igbohunsafẹfẹ giga ati awọn laini ifihan agbara igbohunsafẹfẹ yẹ ki o ya sọtọ bi o ti ṣee ṣe, ati pe o yẹ ki o mu awọn ọna aabo nigbati o jẹ pataki lati ṣe idiwọ kikọlu ara ẹni. Fun titẹ sii ifihan agbara ti n gba ailagbara, rọrun lati ni kikọlu nipasẹ awọn ifihan ita, o le lo okun waya ilẹ lati ṣe aabo lati yi i ka tabi ṣe iṣẹ to dara ti asomọ asomọ igbohunsafẹfẹ giga. Parallel wiring should be avoided on the same level, otherwise distributed parameters will be introduced, which will affect the circuit. If unavoidable, a grounded copper foil can be introduced between the two parallel lines to form an isolation line.

In the digital circuit, for differential signal lines, should be in pairs, as far as possible to make them parallel, close to some, and the length is not much different.

2. Awọn fọọmu ti relays

Ninu wiwọ PCB, iwọn ti o kere julọ ti wiwu ni ipinnu nipasẹ agbara isomọ laarin okun waya ati sobusitireti insulator ati agbara ti isiyi ti nṣàn nipasẹ okun waya. Nigbati sisanra ti bankanje idẹ jẹ 0.05mm ati iwọn jẹ 1mm-1.5mm, 2A lọwọlọwọ le kọja. Iwọn otutu ko yẹ ki o ga ju 3 ℃. Ayafi fun diẹ ninu awọn wiwọn pataki, iwọn ti awọn wiwu miiran lori fẹlẹfẹlẹ kanna yẹ ki o jẹ ibamu bi o ti ṣee. Ni Circuit igbohunsafẹfẹ giga, aye ti wiwa yoo ni ipa lori iwọn ti kaakiri kaakiri ati inductance, ati nitorinaa ni ipa pipadanu ifihan, iduroṣinṣin Circuit ati kikọlu ifihan. In high speed switching circuit, wire spacing will affect signal transmission time and waveform quality. Nitorinaa, aye to kere julọ ti wiwọn yẹ ki o tobi ju tabi dogba si 0.5 mm. O dara julọ lati lo awọn laini gbooro fun wiwa PCB nigbakugba ti o ṣeeṣe.

There should be a certain distance between the printed wire and the edge of the PCB (no less than the thickness of the plate), which is not only easy to install and machining, but also improve the insulation performance.

When wiring can only be connected around a large circle of the line, we should use the flying line, that is, directly connected with short line to reduce the interference brought by long-distance wiring.

The circuit containing magnetic sensitive elements is sensitive to the surrounding magnetic field, while the bend of wiring of high-frequency circuit is easy to radiate electromagnetic wave. If magnetic sensitive elements are placed in PCB, it should ensure that there is a certain distance between the corner of wiring and it.

Ko si adakoja ti o gba laaye ni ipele kanna ti wiwa. For the line that may cross, can use “drill” with “wound” method to solve, let a certain lead namely from other resistance, capacitance, audion etc. device lead foot gap place “drill” past, or from the end of a certain lead that may cross “wound” past. Ni awọn ọran pataki nibiti Circuit jẹ eka pupọ, lati jẹ ki apẹrẹ rọrun, o tun gba ọ laaye lati yanju iṣoro adakoja pẹlu isomọ okun waya.

Nigbati Circuit igbohunsafẹfẹ giga n ṣiṣẹ ni igbohunsafẹfẹ giga, ibaamu ikọlu ati ipa eriali ti wiwa yẹ ki o tun gbero.

Because the client finally changed the previous agreement and required the interface definition and placement as defined by them, they had to change the layout to the diagram on the right. In fact, the entire PCB is only 9cm x 6cm. O nira lati yi ipilẹ gbogbogbo ti igbimọ ni ibamu si awọn ibeere ti awọn alabara, nitorinaa apakan pataki ti igbimọ ko yipada ni ipari, ṣugbọn awọn paati agbeegbe ni a tunṣe ni deede, ni pataki ipo ti awọn asopọ meji ati asọye naa ti pinni won títúnṣe.

But the new layout obviously caused some trouble in the line, the original smooth line became a little messy, the length of the line increased, but also had to use a lot of holes, the difficulty of the line increased a lot.

Alaye ni kikun ti ọna apẹrẹ ti wiwa PCB, paadi alurinmorin ati wiwa epo

It is clear from this example that layout differences can have an impact on PCB design.

Alaye ni kikun ti ọna apẹrẹ ti wiwa PCB, paadi alurinmorin ati wiwa epo

3. Wiring requirements for power cables and ground cables

Ṣe alekun iwọn ti okun agbara ni ibamu si oriṣiriṣi iṣẹ ṣiṣe lọwọlọwọ. Hf PCB yẹ ki o gba okun waya ilẹ agbegbe nla ati ipilẹ ni eti PCB bi o ti ṣee ṣe, eyiti o le dinku kikọlu ti ifihan ita si Circuit; At the same time, the grounding wire of PCB can be in good contact with the shell, so that the grounding voltage of PCB is closer to the earth voltage. Ipo ilẹ yẹ ki o yan gẹgẹbi ipo gangan. Yatọ si Circuit igbohunsafẹfẹ kekere, okun ti ilẹ ti Circuit igbohunsafẹfẹ giga yẹ ki o wa nitosi tabi ipilẹ aaye pupọ. Okun ilẹ yẹ ki o kuru ati ki o nipọn lati dinku ikọlu ilẹ, ati lọwọlọwọ ti o gba laaye yẹ ki o jẹ ni igba mẹta ti lọwọlọwọ ṣiṣẹ. Okun ilẹ ti agbọrọsọ yẹ ki o wa ni asopọ si PCB agbara ampilifaya ti o wu ipele ipele ilẹ, maṣe ṣe ilẹ lainidii.

Ninu ilana wiwọn tun yẹ ki o wa ni akoko titiipa wiwọn diẹ ti o peye, ki maṣe tun wiwọn fun ọpọlọpọ igba. Lati tii wọn, ṣiṣe aṣẹ EditselectNet lati yan Titii ni awọn ohun-ini ti a ti firanṣẹ tẹlẹ.