How does the manufacturer know the physical dimensions and shape of the PCB?
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what is gerber file in pcb Informational
- For mixed-signal PCBs, separate ground planes, careful routing to minimize noise, and shielding techniques are often employed. These design choices, including the layout of ground planes and shielding layers, are reflected in the corresponding Gerber files. How are critical dimensions and tolerances for board features (e.g., connector slots, mounting holes) specified to the manufacturer in conjunction with the Gerber files?
- The layer stackup defines the order and properties of the different layers in a multi-layer PCB, which is crucial for proper fabrication and performance. How do manufacturers use Gerber files to create phototools?
- Step plating involves plating different areas of the PCB to different thicknesses. This requires careful definition of the plating areas in the copper layer Gerber files and specific manufacturing instructions. How are peelable solder masks defined or indicated when generating Gerber files?
- Peelable solder masks are temporary solder masks that can be removed after assembly. The areas requiring peelable solder mask are usually indicated on a mechanical layer or through manufacturing notes. What is the role of the IPC-D-356 netlist format in bare board electrical testing?
- Complex or irregular board outlines are defined using vector graphics in the board outline Gerber file. What is the role of impedance modeling software in designing PCBs with controlled impedance and how does it relate to Gerber files?
- Panel fiducials are placed on the manufacturing panel to allow assembly equipment to accurately align the panel during component placement and soldering. Their locations are defined in the respective layer Gerber files. What are the considerations for generating Gerber files for PCBs with different copper weights on different layers?
- Is there a separate Gerber file for the solder paste layer?
- How can drill file errors impact the PCB? What is the significance of the Gerber file order?
- What are the limitations of the RS-274-D format? How does the Gerber file define copper traces?
- Tooling holes provide reference points for AOI machines to accurately inspect the PCB for defects. Their locations are defined in the drill file and may be indicated on a mechanical layer. What is the role of the Bill of Materials (BOM) in conjunction with the Gerber and pick-and-place files for PCB assembly?
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