The PCB of digital circuit can be composed of a wide ground wire circuit, that is, to form a ground network to use (the ground of analog circuit can not be used in this way) with a large area of copper layer as ground, in the printed board is not used to
From the point of view of function, the hole can be divided into two categories: one is used as an electrical connection between the layers; The second is used for fixing or positioning devices. In terms of technological process, through holes are general
Vertical refers to the component body perpendicular to the circuit board installation, welding, its advantage is to save space, horizontal refers to the component body parallel and close to the circuit board installation, welding, its advantage is that th
There is no through hole between the welding pads of components without external pins (such as chip resistance, capacitor, adjustable potentiometer, adjustable capacitor,
They not only play a conductive role in the design, but also play the role of heat conduction, its thermal conductivity and heat transfer area are relatively large circuit board is an indispensable part of the electronic circuit, its structure is composed
General simulation software cannot take into account some impedance discontinuity wiring conditions due to the line model or the mathematical algorithm used. In this case, only some Temninators, such as series resistors, can be reserved on the schematic d
Through the above analysis of the parasitic characteristics of the holes, we can see that in high-speed PCB design, seemingly simple holes often bring great negative effects to the circuit design.
In the design of high density PCB, the use of non-through-hole and the reduction of through-hole size also bring the cost increase, and the through-hole size can not be reduced indefinitely, it is limited by PCB manufacturers drilling and electroplating t
Copper coating on PCB, if the grounding problem is handled well, is "more advantages than disadvantages", it can reduce the signal line backflow area, reduce the signal external electromagnetic interference.
When the power supply or ground short circuit is found during debugging, the zero ohm resistance can be removed to narrow the search range.
a large number of customized a bunch of non-standard cables, resulting in the production line of the cable versatility is very low, once a model inventory is used up, the relevant car type no cable available, the production line can only shut down and oth
The most basic is often the most difficult to break through, but in the face of 5G, PCB should break the bottleneck, resistance and tolerance components such as "small" is an inevitable trend.
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