Solution to PCB Laminate Problems

Dated:2018-01-30      Popularity:1153

PCB BoardHere are some solutions to several common PCB laminate problems you may encounter. 

Have a reasonable direction

Such as input/output, AC/DC, strong/weak signal, high frequency/low frequency, high pressure/low pressure, etc., their direction should be linear (or separation), and not blend with each other. Its purpose is to prevent mutual interference. The best way is by straight line, but generally it is not easy to achieve; the most unfavorable direction is ring, but fortunately it can be set to improve the isolation. PCB design requirements is lower for DC, small signal, and low voltage, thus the reasonable direction is relative.

Reasonable arrangement of power filter/decoupling capacitor

In general, only a few power filters/decoupling capacitors are shown in the schematic, but no indication is given where they should be connected. In fact, these capacitors are for switching devices (gates) or other components that need to be filtered/decoupled. The layout of these capacitors should be as close as possible to these components. Interestingly, when the power filter/decoupling capacitor layout is reasonable, the problem of grounding becomes less obvious.

Considerations for lines

If condition allowed, use wider lines than thin lines; high-pressure and high-frequency lines should be smooth without a sharp chamfer, and turning can not be used at right angles. Ground should be done as wide as possible and use large area copper, which have a considerable improvement for grounding issue.

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