The design of printed circuit board is to design the circuit board through the design principle, to make the circuit board as low as possible. In the past, it usually needs to complete, expensive special tools can now, with high performance software tools such as DesignSparkPCB and the design model of the growing popularity of free, greatly accelerate the design speed of circuit board design personnel.
Electromagnetic interference (EMI) is an important factor in the design of the circuit board. Electromagnetic interference can be coupled with the channel, thereby disrupting the signal to noise, affecting the overall performance of the circuit board. If the coupling noise is too high, the signal is likely to be completely covered, so it is necessary to install more expensive signal amplifier, to be able to return to normal. However, if the design of the circuit board at the beginning, it can fully take into account the layout of the signal lines, then the problem can be avoided. Due to the design of the circuit board will be based on different equipment, different use location, different heat demand, as well as the different electromagnetic interference (EMI), and different, then the design template will be put on a big use.
Capacitance is also an important issue in the design of circuit board, which can not be ignored, because the capacitance will affect the speed of signal transmission, increase the consumption of electricity. Channel can be coupled with the next line or vertical through the two circuit layer, so as to form a capacitor. By reducing the length of parallel line, thereby cutting off the coupling in one line with the kinks, it is relatively easy to solve the problem. This problem is particularly prominent in the design of the ground. A metal circuit layer that is likely to be coupled with all the lines above and below it. Although the metal layer can effectively prevent noise, but the metal layer also produces associated capacitance, affect the speed of the line, and increase the consumption of electricity.
In the design of printed circuit board, many different methods can be adopted to solve various problems. In which the design of the program itself is adjusted, such as the adjustment of the layout of the line, reduce noise, but also the layout of the printed circuit board. Design components can be automatically installed through the layout tool, but if you can manually adjust the automatic layout, will help to improve the quality of the circuit board design. Through this measure, the design rules will be detected with the help of technical documents, to ensure that the circuit board design to meet the requirements of circuit board manufacturers.
Will be different circuit board layer to separate, can reduce the associated capacitance, but this will increase the number of circuit boards, thereby increasing costs, bring more through the hole aspect of the problem. Although the power supply system of power grid and the physical size of orthogonal design of grounding line might be added by the circuit board, but can be effective ground double circuit board, reduce the complexity of capacitance and circuit board manufacturing.
Design rule detection is also a very powerful tool to detect lines, to ensure that the distance between the lines is not too close, resulting in a short circuit. However, the overall design still has a high economic value. The design planning detection tool can also be used to detect and adjust the power layer and the ground layer, avoiding the generation of large associated capacitance area.