Because of the rapid development of electronic technology, the printed circuit technology has been developing. PCB board through single-sided - double-sided multilayer development, and the proportion of multilayer board is increasing year by year.
This requires careful management of library components, CAD Settings and parameters, component placement, wiring, and power supply network (PDN) design. In addition, layout designers must ensure that their work is fully documented and that the final produ
Solder paste is printed on the circuit board and then the electronics are connected to the circuit board by reflow soldering. This is the most common method in the electronics manufacturing industry, but in order to more accurately apply the solder paste
Select the perfect surface finish option according to the specific requirements and characteristics of the PCB product according to this table.
In the double panel and multilayer plate, in order to connect the printed wires between the layers, a common hole is drilled at the junction of the wires that need to be connected in each layer, that is, through the hole.
The main reason of reflection signal: too long running; Transmission lines with unmatched terminations, excess capacitance or inductance, and impedance mismatches.
Grounding should be added when necessary, two adjacent layers of wiring should be vertical to each other, parallel easy to produce parasitic coupling.
Multilayer circuit board, usually through the hole plate, first board, second board, second stack plate these several. Higher level such as three - level board, arbitrary layer interconnection board usually used very little.
Only when you have all the information is it possible to write test vectors, define component failure styles, or make certain pre-adjustments.
unused gate circuits are often used for design improvements later, and they may be converted into circuits. So it is also important that they are tested from the start to ensure that their artifacts are reliable.
It is best not to use electrolytic capacitors, electrolytic capacitors are two layers of thin film rolled up, this rolled up structure at high frequency performance as inductance, the best use of bile capacitors or polycarbonate gestation capacitors.
It has been proved that the reliability of electronic equipment will be adversely affected even if the circuit diagram is designed correctly and the printed circuit board is not designed properly.
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