The rational layout of the PCB components in the patch processing is the basic premise of designing the high quality PCB diagram. On the requirements of the main components of the installation, stress, heat, signal, beautiful five requirements.



    1, installation
    Refers to a series of basic applications in the case of a specific application, in order to install the circuit board into the chassis, housing, slot, such as space interference, short circuit and other accidents, and make the specified connector in the chassis or the specified location on the shell Claim.
 

    2, force

    Chip processing circuit board should be able to withstand the installation and work of the various external forces and vibration. For this circuit board should have a reasonable shape, the board of various holes (screw holes, shaped holes) the location to be reasonable arrangements. The distance between the hole and the edge of the hole is at least greater than the diameter of the hole. Also note that the thinnest section of the plate caused by the profiled hole should also have sufficient bending strength. The board directly "stretch" out of the device shell connector in particular to be reasonable to ensure long-term use of reliability.
 

    3, heat

    For high-power, heat-generating devices, in addition to guarantee the cooling conditions, but also pay attention to place in the appropriate location. Especially in precision analog systems, pay particular attention to the adverse effects of the temperature field generated by these devices on the fragile preamplifier circuit. General power is very large part of the module should be made alone, and with the signal processing circuit to take some thermal isolation measures.
 

    4, the signal

    Signal Interference The most important factor to consider in PCB layout design. The most basic aspects are: weak signal circuit and strong signal circuit separately or even isolated; AC part and DC part of the separation; high frequency part and low frequency part of the separation; pay attention to the signal line to the direction of the ground; appropriate shielding, filtering And other measures.
 

    5, beautiful

    Not only to consider the neat and orderly placement of components, but also to consider the beautiful line smooth. As the general layman sometimes more emphasis on the former, in order to one-sided evaluation of the merits of circuit design, product image, in the performance requirements are not harsh to give priority to the former. However, in high-performance occasions, if you have to use double-sided, and the circuit board is also packaged in the inside, usually invisible, it should give priority to emphasize the beautiful line.