What problems should be paid attention to in the serpentine wiring of PCB?

stay PCB Wiring , Serpentine wire is a kind of special wiring method . The serpentine is Layout It is a kind of routing method often used in , Its main purpose is to adjust the time delay , Meet the system timing design requirements ; The two key parameters are the parallel coupling length (Lp) And coupling distance (S). that ,PCB What problems should be paid attention to in the serpentine wiring of the circuit board ？

1、 Try to increase the distance between parallel lines , At least greater than 3H,H It refers to the distance from the signal line to the reference plane . Generally speaking, it's a big bend , As long as the distance is large enough , We can almost completely avoid the coupling effect .
2、 Reduce the coupling length . When the double coupling length delay approaches or exceeds the signal rise time , The resulting crosstalk will reach saturation .
3、 The signal transmission delay caused by the serpentine line of stripline or buried microstrip line is less than that of microstrip line .
4、 High speed and signal line with strict timing requirements , Try not to take the serpentine line .
5、 You can often use any angle of the snake line , It can effectively reduce mutual coupling .
6、 High speed PCB In design , Serpentine has no so-called filtering or anti-interference ability , It can only degrade the signal quality , So it is only used for timing matching .
7、 Consider the following important questions carefully ：
（1） Is the minimum number of jumpers used ？ Do jumpers go through components and accessories ？
（2） Can the letters be seen after assembly ? Is the size and model correct ?
（3） To prevent foaming , Has a large area of copper foil been opened ？
（4） Is there a tool locating hole ？

The above is the detailed explanation PCB Some problems should be paid attention to in the serpentine wiring of circuit board , How much do you know ？

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