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
When the power supply or ground short circuit is found during debugging, the zero ohm resistance can be removed to narrow the search range.
Many PCB manufacturers have to go through the network connection test of power-on before PCB processing is completed, to ensure that all the connections are correct.
This top view provides an example of installing a row of ground through holes in the top metal ground area on each side of the intermediate conductor. The circuit current caused by the top layer is short-circuited to the ground below.
Based on the changes in the international trade environment, PCB industry is still under a big test, originally in the capital chain break and environmental pressure impact of small and medium-sized PCB manufacturers, are also accelerating out of the shuf
While this setup is tedious, it's not as bad as an auto-wiring device. Most design teams eventually establish a set of design rules that aim to: standardize bare board construction costs to maximize yield; Assemble, inspect, and test as consistently as po
Unless the constraints of the auto-routing algorithm have been highly fine-tuned by the designer, the auto-routing results still need to be manually checked for weaknesses in the backtracking algorithm results.
The problem is clear. A technically correct but confusing schematic is still a bad schematic." Although this view is easy to accept, in CAD programs, an unreadable schematic diagram can still describe the circuit connection information, and is still ...
Therefore, welding resistance data cannot be generated directly from similar pad. When applying solder resistance, the filler block area will be covered by solder resistance, resulting in difficulty in welding components.
Similarly, there is also a parasitic inductance through the hole. In high-speed digital PCB, the harm caused by the parasitic inductance is often greater than the parasitic capacitance.
What is the core power supply, is some power supply current, the number of the kind. A plane, not more than 3 power supply division. It is important to consider that segmentation cannot present current-carrying bottlenecks.
At the same time, it should be noted that the transmission line on the PCB should not have mutations or corners, and the impedance of each point of the transmission line should be kept continuous as far as possible, otherwise there will be reflections bet
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