Question 1: What is PCB component packaging and what are the differences between it and the components?

Answer: (1) Component packaging refers to the appearance and solder joint position indicated when the practical component is soldered to the circuit board.

(2) Part packaging only refers to the appearance and solder joint position of the parts, and simple part packaging is only a concept of space, so different parts can share the same part packaging; On the other hand, the same type of component can also have different packaging, such as RES2 representing resistors, which can be packaged in AXAIL0.4? 、 AXAIL0.3? 、 AXAIL0.6 and so on, so when using welded parts, not only do you need to know the part name, but also the packaging of the part.

(3)? The packaging of parts can be specified when planning circuit diagrams or when introducing network tables. When planning a circuit diagram, it is possible to specify it in the Footprint settings in the part properties dialog box, and it is also possible to specify part packaging when importing a netlist.

Question 2: What are the differences between wires, cables, and networks?

Answer: Wires, also known as copper film routing, are used to connect various solder joints and are the most important part of printed circuit boards. Printed circuit board planning revolves around how to arrange the wires.

Another type of wire related to wires, often referred to as a flying wire or a pre drawn wire. Flywire is a type of wiring generated by the system based on rules after the introduction of network tables, used to guide routing.

Flying wires and conductors have essential differences. Flywire is only a way of connecting wires, which only represents the connection between various solder joints in a certain way and has no electrical connection significance. The wire is arranged based on the connection between the solder joints indicated by the flying wire, and has electrical connection significance as a connecting circuit.

Networks and wires are different, as networks also include solder joints. Therefore, when it comes to networks, not only are the wires referred to, but also the solder joints connected to the wires.

Question 3: What is the difference between the inner layer and the central layer?

Answer: The central layer and the inner layer are two easily confused concepts. The central layer refers to the central board layer used for wiring, in which the wires are laid; The inner layer refers to the power layer or ground layer, which is generally not wired and is composed of a whole copper film.

Question 4: What are internal network tables and external network tables, and what are the differences between the two?

Answer: Network tables can be divided into external network tables and internal network tables. External network table refers to the introduced network table, which is the schematic network table generated by Sch or other schematic planning software; The internal network table is a modified network table used for wiring within the PCB system based on the imported external network table. Strictly speaking, these two types of network tables are completely different concepts, but readers do not need to make a strict distinction.

Question 5: What is the function of a network table manager?

Answer: At the top of the list, we introduce a network table, which is actually the process of loading the data planned by the schematic into the PCB planning system. All changes to data in the PCB planning system can be completed through Netlist Macro, which automatically generates network macros by comparing and analyzing network table files and internal data of the PCB system.

Secondly, the network table manager can be used to directly modify the connection between various components of the circuit board in the PCB system, forming a network table.

Article source: Jiangmen PCB Customizationhttp://www.yonghongpcb.com/