The specification of PCB design directly affects every process in PCB manufacturing and the electrical performance of the board.
Excellent PCB design ability is a prerequisite for a qualified hardware engineer, and it is also an important indicator to measure the overall quality of a hardware engineer.
In order to improve the standardization of PCB circuit board design and product yield, improve everyone's design capabilities, and speed up everyone's growth, the editor has once again invited Daniel from Benqiang Circuit Design Division to talk to you about PCB design. Experience.
We will launch a series of articles on PCB design later. Today we will first talk about the layout design principles in PCB design and take a look at its requirements in this regard.
1) The distance from the edge of the board should be greater than 5mm.
2) Place components closely related to the structure first, such as connectors, switches, power sockets, etc.
3) Prioritize the core components and larger components of the circuit function block, and then place the surrounding circuit components with the core components as the center.
4) High-power components should be placed in a position that is conducive to heat dissipation. If a fan is used for heat dissipation, they should be placed on the mainstream channel of the air; if conductive heat dissipation is used, they should be placed close to the chassis guide groove.
5) Components with large mass should be avoided in the center of the PCB and should be placed close to the fixed edge of the board in the chassis.
6) Keep components with high-frequency connections as close as possible to reduce the distribution parameters and electromagnetic interference of high-frequency signals.
7) Keep input and output components as far away as possible.
8) Components with high voltage should be placed out of easy reach during debugging.
9) Thermal sensitive components should be kept away from heating components.
10) The layout of adjustable components should be easy to adjust. Such as jumpers, variable capacitors, potentiometers, etc.
11) Consider the signal flow direction and arrange the layout reasonably to keep the signal flow direction as consistent as possible.
12) The layout of the PCB circuit board should be even, neat and compact.
13) When laying out surface mount components, attention should be paid to keeping the pad directions as consistent as possible to facilitate assembly and soldering and reduce the possibility of bridging.
14) The decoupling capacitor should be placed close to the power input terminal.