Select the Load Model tab, and you’ll see a model type of Intrinsic Device/No Model listed. Let’s now select the Map button to continue. Here we can see that the resistor already has a Spice Type of R: Resistor. EAGLE will automatically assign a Spice Type for all the symbols in your schematic, but you always need to double check them for accuracy. To start, we need to make sure the proper Spice Type is selected. There’s nothing more that needs to be done for these two, so let’s focus on the remaining parts we need to map: R1, LED1, and G1. These are the existing ground symbols that EAGLE automatically converted to node 0 for us. Take a look at the Done column, and you can see two green checkmarks for GND1 and GND2. You should now be looking at the Add Model dialog as shown below: To make our lives easier EAGLE does all the work of converting your GND parts to node 0, so just select the Yes button to continue. This signifies ground and is used in all of your simulation calculations. In SPICE you always need to have a node 0 in your netlist. You’ll first get a dialog asking if you want to convert all parts with GND in their name to spice ground node 0. Next, you’ll right-click on any of the highlighted parts and select Add Model. Select the Group icon on the left-hand side of your interface, then click and drag a selection box around all of the parts. To begin, we need to select all of the symbols using the Group command. We’re now going to walk through how to map all of the symbols on this schematic to SPICE models. To convert your schematic a process of part mapping is required. If they’re not then you won’t be able to simulate. If you click the Simulate button at the top of your interface EAGLE will remind you about this:īefore opening the Simulation dialog, EAGLE will always confirm that all of your parts are linked to SPICE Models. None of the parts on this schematic are SPICE compatible at the moment. This is a simple circuit, but it serves our purpose well. Look for the convert project folder within the Projects » ngspice directory in your Autodesk EAGLE control Panel. We’ve got another example project lined up made specifically for converting a non-SPICE schematic. In this blog, we’ll be looking at how to convert a current schematic into one that’s SPICE compatible. But wait, you might be asking, how can I simulate all of my existing designs? There’s still more to learn. Welcome back to our SPICE Simulation Series, Part 5! We’ve completed our full tour of the new SPICE features in Autodesk EAGLE 8.4. SPICE Simulation Part 5: Converting Your Existing Schematics to SPICE SPICE Simulation Part 5: Schematic to SPICE Mapping
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