1. The signal line that needs to be impedance should be set in strict accordance with the line width and line distance calculated by the stack. For example, radio frequency signal (normal 50R control), important single-ended 50R, differential 90R, differential 100R and other signal lines, the specific line width and line spacing can be calculated by stacking (pictured below).

How to set the line width and line spacing in PCB hoahoa

2. The designed line width and line spacing should consider the production process capability of the selected PCB production factory. If the line width and line spacing is set to exceed the process capability of the cooperating PCB manufacturer during the design, unnecessary production costs need to be added, and the The design cannot be produced. Generally, the line width and line spacing are controlled to 6/6mil under normal circumstances, and the via hole is 12mil (0.3mm). Basically, more than 80% of PCB manufacturers can produce it, and the production cost is the lowest. The minimum line width and line spacing is controlled to 4/4mil, and the via hole is 8mil (0.2mm). Basically, more than 70% of PCB manufacturers can produce it, but the price is slightly more expensive than the first case, not too expensive. The minimum line width and line spacing is controlled to 3.5/3.5mil, and the via hole is 8mil (0.2mm). At this time, some PCB manufacturers cannot produce it, and the price will be more expensive. The minimum line width and line spacing is controlled to 2/2mil, and the via hole is 4mil (0.1mm, at this time, it is generally HDI blind buried via design, and laser vias are required). At this time, most PCB manufacturers can’t produce it, and the price is the most expensive of. The line width and line spacing here refer to the size between elements such as line-to-hole, line-to-line, line-to-pad, line-to-via, and hole-to-disk when setting rules.

3. Whakatakotoria he ture ki te whakaaro ki te pounamu hoahoa i roto i te konae hoahoa. Mena he maramara BGA 1mm, he papaku te hohonu o te titi, kotahi noa te raina tohu e hiahiatia ana i waenga i nga rarangi e rua o nga titi, ka taea te whakarite ki te 6/6 mil, he hohonu ake te hohonu o te titi, me nga rarangi titi e rua e hiahiatia ana. Kua whakaritea te raina tohu ki te 4/4mil; he maramara BGA 0.65mm, i te nuinga o te waa ki te 4/4mil; he maramara BGA 0.5mm, ko te whanui raina whanui me te mokowhiti raina me whakarite ki te 3.5 / 3.5mil; he 0.4mm BGA Chips te tikanga e hiahia ana te hoahoa HDI. I te nuinga o te waa, mo te hoahoa pounamu, ka taea e koe te whakarite i nga ture a-rohe (tirohia te mutunga o te tuhinga [rorohiko AD ki te whakatakoto ROOM, rorohiko ALLEGRO ki te whakatakoto ture rohe]), tautuhia te whanui raina rohe me te mokowā raina ki te waahi iti, ka tautuhi nga ture mo etahi atu waahanga o te PCB kia nui ake mo te hanga. Te whakapai ake i te reiti tohu o PCB whakaputaina.

4. Me whakarite kia rite ki te kiato o te hoahoa PCB. He iti ake te kiato, he mahorahora te papa. Ko te whanui o te raina me te mokowhiti raina ka taea te whakarite kia nui ake, me te rereke. Ka taea te whakarite i nga mahinga e whai ake nei:

1) 8 / 8mil, 12mil (0.3mm) ma te poka.

2) 6 / 6mil, 12mil (0.3mm) ma te poka.

3) 4 / 4mil, 8mil (0.2mm) ma te poka.

4) 3.5 / 3.5mil, 8mil (0.2mm) ma te poka.

5) 3.5 / 3.5mil, 4mil ma te poka (0.1mm, te keri laser).

6) 2 / 2mil, 4mil ma te poka (0.1mm, te keri laser).