The fourth floor is originally the fourth floor. Let's have a look

Multi-storey pcb It is the electronic information technology moving towards high speed 、 multi-function 、 The large capacity 、 Small size 、 Thin 、 The product of lightweight development . For making pcb Plate speaking , The more layers , The more programs you make , Then the failure rate will increase , The higher the corresponding cost , So generally, multilayer boards are used in advanced circuits . Take the four ply board for example , You know the fourth floor pcb Which four floors is the board ？

four layers pcb The four layers in the board are divided into ： Signal layer （ top floor ） 、 Signal layer （ Bottom ）、 Power layer （ Middle layer ） And strata （ Middle layer ）.

Usually in the circuit board , Components are usually placed on the top floor , So the top layer is also called component surface ; The bottom layer is usually used for welding , So the bottom layer is also called the welding surface . But for the SMD For components , Both the top and bottom layers can be used to place components .

 

four layers pcb Layout of each layer of the board ：

1. There are many on the first floor in the middle GND And lay them separately , You can take a few lines , But don't divide each copper layer ; The second floor in the middle VCC Copper laying: separate laying of multiple power supplies , You can take a few lines , But don't divide each shop .

2. There are four wiring layers , It's usually TOP LAYER top floor , Buttom Layer Bottom , VCC and GND These four floors . Generally, through holes are used 、 Bury the hole 、 Blind holes to connect layers to each other , Than double layer pcb The plate has multiple embedded holes and blind holes . in addition ,VCC and GND Try not to use signal lines in these two layers .

Above stool “ four layers pcb Which four floors is the board ” Knowledge about , I hope it helped you .

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