The most critical problem is not to cross the divide gap wiring, once across the divide gap wiring, electromagnetic radiation and signal crosstalk will increase sharply. The most common problem in PCB design is EMI problem caused by signal lines crossing
The gold plating of the plug is hard gold, wear-resistant, pluggable hundreds of times, requiring that the gold layer has a certain hardness, and the gold liquid in the gold groove contains trace cobalt (nickel, antimony) elements.
Automated testing is essential to validate the manufacture of printed circuit boards. The bare board test will check that the wood-based board has good connectivity, while the ICT and fly pin tests will verify the board assembly and welded connections.
Now there are many ways to layer, there are potions corrosion, tool stripping, but it is easy to put the layer over, lost data. Experience tells us that sandpaper is the most accurate.
the general double panel copying board is much simpler than the multi-layer copying board, multi-layer copying board is prone to inaccurate situation, So the multilayer board copy board to be particularly careful and careful (which internal through holes
the dielectric constant is small, can be used in high frequency. If applied to the electronic communication industry, it can greatly reduce the signal loss rate. The price of ordinary PCB board on the market will vary according to different materials.
Chip-on-chip (WCSP) or core-sized ball grid arrays (DSBGA) use fine-pitch wire bonding and flip-chip interconnection, and are available in SiP, modular, stacked and recessed core-based formats.
an all-digital system may not have a separate analog power plane, and adding a new power plane can become prohibitively expensive unless the designer creates a partitioned island or separate plane on top of the existing layer.
Gold deposition is used by chemical deposition, through the method of chemical REDOX reaction to generate a layer of coating, generally thick, is a kind of chemical nickel gold deposit method, can reach a thicker gold layer.
The cooling metal block of the three-end voltage regulator must be well grounded. The grounding isolation belt near the crystal oscillator must be well grounded.
With the rapid development of mobile phone, electronics, communication industry, automatic driving, to a large extent, the PCB circuit board industry continues to grow and grow rapidly, people for the quality of PCB components, layers, weight, precision,
These PCBS are widely used in mechanically sensitive devices because the flexibility allows the board to resist vibration. Flexible PCB is more durable than traditional PCB, but flexible PCB manufacturing process is sensitive and complex.
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