The netlist is used for the PCB authoring process. This information compliments the schematic but is also useful for ordering components and assembling the PCB.Ī netlist captures a list of every pin and what that pin is connected to. The Bill-of-Materials (BOM) is a list of every component, quantities, and ordering information. This is very helpful for design reviews or regulatory evaluation regarding safety or compliance of a product. The primary purpose of a schematic is to capture the electrical design. The main exports of this process are a schematic diagram (SCH), Bill of Materials (BOM), and netlist. Schematic symbols represent electronics components, and are linked together using a combination of nets, busses, and net labels. This function captures the electrical design information including which components are used, and how each component is connected together. Schematic Capture is the next function of an EDA tool. Free symbols are generally not audited and may lead to manufacturing defects. I also recommend being especially cautious when using free symbols. I recommend creating a test board to verify that some footprints are correct before using them for production designs. If you choose to purchase access to a library of EDA components, which is possible for most tools, make sure that you trust the author. Accuracy of this information is essential – because the other functions of EDA tools trust the library and rely on the information being correct.Įrrors here will trickle through the process, and can lead to major issues in physical prototypes. This process is the most manual, relying on a person to interpret datasheet information about the electrical function and physical location of each pin. Symbols used for schematic capture are generally called symbols, and symbols used for PCB layout are generally called footprints. Library management is focused on linking orderable parts to appropriate symbols. This automation accelerates the design process, shortens time-to-market, and reduces defects in hardware designs.Īll EDA tools focused on circuit design share many common features, one of these is library management. While EDA has grown far beyond the scope of schematic capture and PCB layout, now including various thermal, electromagnetic, and Integrated Circuit design tools- electronics design is still a core part of EDA.Ĭurrent EDA tools provide ways to link circuit simulation, schematic capture, and PCB layout. Over time, especially after the PCB was invented, the process of linking every component and net between the schematic and physical implementation became a massive part of the electronics design process. Through a combination of drafting tools, stencils, and careful manual process – a circuit diagram was drawn. The first circuits were created before the Printed Circuit Board (PCB) was invented, and schematics were drawn by hand. Function 5 – Manufacturing and Fabrication ExportsĮlectronic Design Automation (EDA) tools are the latest version of a 20 th century innovation.Function 3 – Schematic Design Rule Checks (DRC).
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