Simulation in ltspice

  1. Simulation:
    1. Before you do the simulation:
      • You have to have your circuit properly drawn and saved.
      • There must not be any floating parts on your page (i.e. unattached devices).
      • You should make sure that all parts have the values that you want.
      • There are no extra wires.
      • It is essential that you have a ground in your circuit.
    2. Choosing a simulation:
      • Click on the Simulate button on the tool bar simulate icon or use the “Simulate/Edit Simulation Cmd” command.
        simulate menu
      • Enable whatever type(s) of analysis you want using the Edit Simulation Command window. The last one you choose is the one which will be done when you simulate.
      • Click on the Simulate button on the tool bar simulate icon or use the “Simulate/Run” command.
      • It will check to make sure you don’t have any errors. If you do have errors, correct them.
    3. Graphing:
      • Go to the “View” menu:
        view menu
    4. Adding/Deleting Traces:
      • Use “Visible Traces” or add trace icon on the toolbar to select all the traces you want.
      • The add traces window allows you to choose various signals from the circuit, or to create mathematical expressions involving them. visible waveforms window
      • To delete a trace, select its title on the graph and press “Delete”.
    5. Doing Math:
      • In Visible Traces, there are functions that can be performed, these will add/subtract (or whatever you chose) the lines together. visible waveforms window
      • Select the signal(s) that you wish to have displayed.
      • There are many functions here that may or may not be useful. If you want to know how to use them, you can use LTspice’s Help Menu.
    6. Labeling:
      • Click on Text Label text label icon on top tool bar.
      • Type in what you want to write.
      • Click OK
      • You can move this around by single clicking and dragging.
    7. Finding Points: (aka Using Cursors)
      • Click on the name of the trace you want to look at and then a cursor window will appear, showing information about the point currently selected. cursor window.
        Note that if you right click on the trace name, you can choose to show two cursors. This then allows automatic math to be done, such as to give the difference between them in both dimensions.
      • You can use the cursor keys to move back and forth through the data points.
    8. Saving:
      • To save your probe you need to go into the tools menu and click display, this will open up a menu which will allow you to name the probe file and choose where to save it. You can also open previously saved plots from here as well.
    9. Printing:
      • Select Print in Edit or on the toolbar print icon .
      • Print as usual.
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