Ntawv luam tawm hauv Circuit Court board (PCB) yog kev txhawb nqa cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob. Nws muab hluav taws xob sib txuas ntawm cov khoom siv hluav taws xob thiab cov khoom siv. With the rapid development of electronic technology, PCB density is getting higher and higher. Lub peev xwm ntawm PCB tsim los tiv thaiv kev cuam tshuam ua rau muaj qhov sib txawv loj. Practice has proved that even if the circuit schematic design is correct and the printed circuit board design is improper, the reliability of electronic products will be adversely affected. For example, if two thin parallel lines on a printed board are close together, there will be a delay in the signal waveform, resulting in reflected noise at the end of the transmission line. Therefore, when designing printed circuit board, we should pay attention to the correct method, comply with the general principle of PCB design, and should meet the requirements of anti-interference design.

Cov hauv paus ntsiab lus ntawm PCB tsim

The layout of components and wiring is important for optimal performance of electronic circuits. In order to design PCB with good quality and low cost, the following general principles should be followed:

1. Cov xov hlau

Cov hauv paus ntsiab lus ntawm kev thaiv yog raws li hauv qab no:

(1) Cov kab hluav taws xob sib txuas ntawm cov tswv yim thiab cov khoom siv yuav tsum raug zam kom deb li deb tau. Nws yog qhov zoo dua los ntxiv cov xov hlau hauv av ntawm cov xov hlau kom tsis txhob tawm tswv yim sib txuas.

(2) The minimum width of PCB wire is mainly determined by the adhesion strength between wire and insulating substrate and the value of current flowing through them. When the thickness of copper foil is 0.5mm and the width is 1 ~ 15mm, the current through 2A, the temperature will not be higher than 3℃. Therefore, the wire width of 1.5mm can meet the requirements. For integrated circuits, especially digital circuits, 0.02 ~ 0.3mm wire width is usually selected. Of course, whenever possible, use wide wires, especially power and ground cables. Qhov sib nrug tsawg kawg ntawm cov xov hlau feem ntau yog txiav txim siab los ntawm kev tiv thaiv hluav taws xob thiab qhov hluav taws xob tawg ntawm cov xov hlau hauv qhov xwm txheej phem tshaj. For integrated circuits, especially digital circuits, the spacing can be less than 5 ~ 8mil as long as the process permits.

(3) Cov ntawv xov hlau khoov feem ntau siv lub voj voos, thiab Txoj Cai Ncaj Ncees lossis suav nrog Lub kaum ntse ntse hauv qhov hluav taws xob ntau zaus yuav cuam tshuam rau kev ua haujlwm hluav taws xob. In addition, avoid using large copper foil as far as possible, otherwise, when heated for a long time, copper foil is easy to expand and fall off. Thaum cov cheeb tsam loj ntawm cov ntawv ci tooj liab yuav tsum tau siv, nws yog qhov zoo tshaj los siv daim phiaj. Qhov no yog qhov muaj txiaj ntsig zoo rau kev tshem tawm cov ntawv ci tooj liab thiab cov khoom sib txuas nruab nrab ntawm cov cua sov uas tsim los ntawm cov pa hluav taws xob.