Question 1: What is a part package and how is it different from a part?
Answer:
(1) A part package refers to the appearance and solder joint positions indicated when the actual part is soldered to the printed circuit boards (PCBs).
(2) The part package solely encompasses the physical appearance of the part and the positioning of solder joints. Essentially, the part package represents a spatial concept, allowing different parts to share identical packages. Conversely, the same part may have various packages. For instance, RES2 denotes resistance, with package variations such as AXAIL0.4, AXAIL0.3, AXAIL0.6, etc. Therefore, when procuring soldered parts, it is imperative not only to recognize the part’s name but also its corresponding package.
(3) The specification of part packages can occur during circuit diagram design or when importing the netlist. During circuit design, it can be designated within the “Footprint” setting in the part properties dialog box or upon netlist importation.
Question 2: What is the difference between wires, flying leads and nets? Answer: A wire, also known as a copper film trace or wire, connects solder joints and is crucial in printed circuit boards (PCBs). PCB design depends on how wires are arranged. Another related type of wire is a flying wire, also known as a pre-pulled wire, which is a connection generated by the system to guide wiring based on the netlist rules. Flying leads and wires have essential differences; flying leads only represent connection relationships without electrical significance, whereas wires have electrical connections based on the flying leads’ indications. Nets, which include solder joints, differ from wires; when referring to nets, both wires and connected solder joints should be considered.
Question 3: What is the difference between inner layer and middle layer? A: The middle layer and inner layer are often confused. The middle layer is used for wiring and contains distributed wires, while the inner layer, such as the power or ground layer, typically consists of an entire piece of copper film without wiring.
Question 4: What is an internal netlist and an external netlist and how do they differ? Answer: Internal and external netlists are the two types of network tables. An external netlist, generated by software like Sch, is the schematic netlist imported into the PCB system. The internal netlist is modified from the external netlist for PCB board wiring. Although distinct concepts, readers need not strictly differentiate between the two.
Question 5: What does the netlist manager do? Answer: The netlist manager facilitates the introduction and editing of netlists in the PCB design system. It loads schematic data into the PCB board system, allowing for changes through the Netlist Macro. Users can directly edit the circuit board component connections to form a netlist using the netlist manager.
Question 6: What is a class and why is it beneficial? Answer: A class refers to a group of units with shared characteristics. In PCB design, users can define class meaning and composition. Introducing classes in PCB design aids in simplifying wiring and component management. Classes help organize and treat specific networks differently, ensuring safety spacing and wire width requirements are met consistently throughout the design.
Question 7: How can extra solder joints be added to a network? Answer: To add solder joints, place them on the circuit board and adjust their network assignment by double-clicking the solder joint to access the settings dialog box and selecting the appropriate network in the Advanced section.
Question 8: What is the purpose of inner segmentation? Answer: Divided inner layers can enhance anti-interference capabilities and protect important circuits by connecting them separately.
Question 9: What is the function of copper coating and what precautions should be taken? Answer: Copper coating on PCBs improves anti-interference ability and is used to wrap wires or fill teardrops on circuits. Care should be taken when applying copper coating for these purposes.
Answer:
(1) A part package refers to the appearance and solder joint positions indicated when the actual part is soldered to the printed circuit boards (PCBs).
(2) The part package solely encompasses the physical appearance of the part and the positioning of solder joints. Essentially, the part package represents a spatial concept, allowing different parts to share identical packages. Conversely, the same part may have various packages. For instance, RES2 denotes resistance, with package variations such as AXAIL0.4, AXAIL0.3, AXAIL0.6, etc. Therefore, when procuring soldered parts, it is imperative not only to recognize the part’s name but also its corresponding package.
(3) The specification of part packages can occur during circuit diagram design or when importing the netlist. During circuit design, it can be designated within the “Footprint” setting in the part properties dialog box or upon netlist importation.
Question 2: What is the difference between wires, flying leads and nets? Answer: A wire, also known as a copper film trace or wire, connects solder joints and is crucial in printed circuit boards (PCBs). PCB design depends on how wires are arranged. Another related type of wire is a flying wire, also known as a pre-pulled wire, which is a connection generated by the system to guide wiring based on the netlist rules. Flying leads and wires have essential differences; flying leads only represent connection relationships without electrical significance, whereas wires have electrical connections based on the flying leads’ indications. Nets, which include solder joints, differ from wires; when referring to nets, both wires and connected solder joints should be considered.
Question 3: What is the difference between inner layer and middle layer? A: The middle layer and inner layer are often confused. The middle layer is used for wiring and contains distributed wires, while the inner layer, such as the power or ground layer, typically consists of an entire piece of copper film without wiring.
Question 4: What is an internal netlist and an external netlist and how do they differ? Answer: Internal and external netlists are the two types of network tables. An external netlist, generated by software like Sch, is the schematic netlist imported into the PCB system. The internal netlist is modified from the external netlist for PCB board wiring. Although distinct concepts, readers need not strictly differentiate between the two.
Question 5: What does the netlist manager do? Answer: The netlist manager facilitates the introduction and editing of netlists in the PCB design system. It loads schematic data into the PCB board system, allowing for changes through the Netlist Macro. Users can directly edit the circuit board component connections to form a netlist using the netlist manager.
Question 6: What is a class and why is it beneficial? Answer: A class refers to a group of units with shared characteristics. In PCB design, users can define class meaning and composition. Introducing classes in PCB design aids in simplifying wiring and component management. Classes help organize and treat specific networks differently, ensuring safety spacing and wire width requirements are met consistently throughout the design.
Question 7: How can extra solder joints be added to a network? Answer: To add solder joints, place them on the circuit board and adjust their network assignment by double-clicking the solder joint to access the settings dialog box and selecting the appropriate network in the Advanced section.
Question 8: What is the purpose of inner segmentation? Answer: Divided inner layers can enhance anti-interference capabilities and protect important circuits by connecting them separately.
Question 9: What is the function of copper coating and what precautions should be taken? Answer: Copper coating on PCBs improves anti-interference ability and is used to wrap wires or fill teardrops on circuits. Care should be taken when applying copper coating for these purposes.
