PCB connection method analysis
PCB is the basic component of electronic products. PCB must be connected with other devices in electronic products. This is the interconnection of PCB. In general, there are three aspects of PCB connection: chip and PCB, internal PCB, PCB and external devices.
Analysis of PCB connection methods
1. The interconnection between chip and PCB
The problem of interconnection between chips and PCBs is that the interconnection density is too high, which will cause the basic structure of the PCB sheet to become a factor limiting the growth of interconnection density. The solution is to use a local wireless transmitter inside the chip to transmit data to the adjacent circuit board.
Second, internal interconnection
The interconnection in the PCB board should follow these principles: use high-performance PCB, and its insulation constant value is controlled in layers to manage electromagnetic fields. Avoid using leaded components, and avoid using via processing technology on sensitive boards, because this process will cause lead inductance at the via. Choosing electroless nickel plating or immersion gold plating process can provide better skin effect for high-frequency current.
Three, external connection
There are mainly the following types of external connections:
1. Wire welding
It is only necessary to directly solder the external connection points on the PCB printed board and the components or other parts outside the board with wires, without any connectors.
2. Cable welding
It is often used for the connection of two printed boards at an angle of 90 degrees. After the connection, it becomes an integral PCB printed board component.
3. Printed board socket
In more complex instruments and equipment, this connection method is often used. Make a printed plug from the edge of the PCB printed board. The plug part is designed according to the size of the socket, the number of contacts, the distance of the contact, the position of the positioning hole, etc., so that it matches the special PCB printed board socket.
4. Standard pin connection
Suitable for use in small instruments, two printed boards are connected by standard pins, and the two printed boards are generally parallel or vertical.