Hd understand the basic architecture of tight HDI board PCB
The inner laser hole needs to be electroplated and filled, and then the outer laser hole is made. The price is more expensive than the error hole.
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Characteristic impedance problem of PCB technology in high-speed design
This simple statement connects the common sense of capacitance with the newly discovered theory of characteristic impedance.
pcb organic coating
the traditional aluminum sheet plugging process is changed, and the plate surface welding and plugging are completed with white mesh. Stable production and reliable quality.
SMT patch processing basic introduction
Pin tin absorption can also be reduced by a flux with a slower wetting rate and a higher active temperature, or by a solder paste with different proportions of Sn/Pb to block melting.
Methods to suppress electromagnetic interference
The resistance value of the terminal resistance should match the characteristic impedance of the line. This can be done manually or by CAD tools to calculate the characteristic impedance value and the terminal matching resistance value.
Multiple logic level threshold crossing errors
Causes of reflected signals: excessively long lines, unterminated transmission lines, excessive capacitance or inductance, and impedance mismatch.
Consider the overall aesthetics
The success of a product, one is to pay attention to the internal quality, two is to take into account the overall beauty, both are more perfect in order to consider the product is a success.
Design of controllability and electromagnetic compatibility of high speed PCB
There is a little bit of short circuiting between digital and analog, but note that there is only one connection point. There are also differences on the PCB, which is determined by the system design.
Blind hole board fabrication knowledge of circuit board
Notice When the laser holes and the inner buried holes are inserted together, that is, the holes of the two drilling belts are in the same position, you need to move the laser holes to ensure electrical connection.
Hd understand the basic architecture of tight HDI board PCB
With the introduction of surface mount technology, automatic detection technology of circuit board is applied, and the packaging density of circuit board increases rapidly.
Detailed analysis of the basic knowledge of circuit board
The circuit board makes the circuit miniaturized and intuitive, which plays an important role in the mass production of fixed circuit and the optimization of electrical appliance layout.
The cause of electromagnetic interference in PCB and the technique of eliminating interference
In PCB, EMI can be produced for many reasons, such as: RF current, common mode level, ground loop, impedance mismatch, magnetic flux
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