PCB News - General principles of circuit board design layout

General principles of PCB board design layout
The general layout is carried out according to the following principles:

1. . According to the reasonable division of electrical performance, it is generally divided into: digital circuit area (that is, afraid of interference and interference), analog circuit area (fear of interference), power drive area (interference source);

2. . Circuits that complete the same function should be placed as close as possible, and each component should be adjusted to ensure the most concise connection; at the same time, adjust the relative position between the functional blocks to make the connection between the functional blocks the most concise;

3. . The I/O drive device is as close as possible to the edge of the printed board and to the lead-out connector;

4. . The clock generator (such as crystal oscillator or clock oscillator) should be as close as possible to the device that uses the clock;

5. . Between the power input pin of each integrated circuit and the ground, a decoupling capacitor (generally a monolithic capacitor with good high-frequency performance is used); when the board space is dense, one can also be added around several integrated circuits Tantalum capacitors.

6. . A discharge diode should be added to the relay coil (1N4148 is sufficient)

7. . For high-quality components, the installation location and installation strength should be considered; heating components should be placed separately from temperature-sensitive components, and thermal convection measures should be considered when necessary;

8. . The layout requirements should be balanced, dense and orderly, not top-heavy or heavy

Special attention is required. When placing components, the actual size of the components (occupied area and height) and the relative position between the components must be considered to ensure the electrical performance of the circuit board and the feasibility and convenience of production and installation. At the same time, under the premise of ensuring that the above principles can be reflected, the placement of the components should be appropriately modified to make them neat and beautiful. For example, the same components should be placed neatly and in the same direction, and should not be placed "scatteredly".

This step is related to the overall image of the board and the difficulty of wiring in the next step, so a little effort must be taken into consideration. When laying out, you can make preliminary wiring and fully consider the places that are not sure about it.

The above is an introduction to the general principles of circuit board design and layout. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.