LTspice, tutorial: Part 1 - Simon Bramble

Basic Circuit Simulation with

LTSpice is capable of several types of simulation, but today we'll be covering just two:.tran and.AC, which stand for Transient and AC Sweep analysis, respectively.F6: Copy, f7: Move without wires, f8: Drag/move with wires, f9: Undo ( shift F9 to redo).

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specify order of magnitude (so you don't have to write "ohms" after every number and it's important to note that in LTSpice, "m" and "M" mean "milli while you

use "MEG" (or something like 1000k) to specify. Alternatively, to bring up the 'jig' select File - New Schematic then press the icon and navigate to the component you need, then click 'Open this macromodel's test fixture as shown in FIG. Using the shortcut keys and the toolbar construct the schematic shown in FIG. FIG 3, in the schematic above, V1 and V2 are the /-15V supply to the LT1012, so we will keep these. The Schematic Window can now be moved between screens. The probe colour will change from red to black. We now need to add some labels to the circuit. Giving the same name to two objects connects them as if you had a wire between the two and is a good way to reduce clutter (as well as specify where you are interested in probing once you actually simulate). Regarding wires, clicking once will anchor the wire to the point you clicked and allow you to change direction (hold ctrl while pressing F3 to place wires that aren't at right angles and you can draw wires directly through multiple components to connect them quickly. Removing a trace can be done by right-clicking its name at the top of the output window, or by pressing F5 and clicking. You precio should see a graph fill half of the LTSpice window, but there won't be anything in it yet: In order to get a look at the circuit output, you'll need to choose what parts of the circuit you want to see. You can do this one of two ways: Right-click on the black graph and hit "Add Trace then choose the net you want to display. Thereafter all plots will be referenced with respect to that node. You can then move the Red Green and Blue sliders to pick a colour of your choice. For now, choose something like what is shown below: Once you've placed the simulation command, it's time to check out some traces. FIG 2, save this file to your chosen directory. Sometimes it is convenient to have 2 plot panes, your especially when comparing 2 voltages of very different amplitudes. It should look like FIG. You can find most of these on the toolbar above the circuit window, or in the "Edit" and "View" menus as well, if you prefer to access them that way. Click on the Label icon and add IN to the input and OUT to the output. F4: Label net, f5: Delete (press F5 then click the component). Drawing a wire straight through several components is an easy way of connecting the components in series. Holding down the ALT key and left clicking over a wire plots the current in the wire. F2 to access the component menu, which is where you'll find voltage sources and op-amp models.

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Youapos, re going to simulate a bandpass LC filter with a center frequency of around 50MHz. Ll see a screen like the one below. Click on Tools Sync Release to ensure you have the latest updates. Ll provide an overview of AC and DC simulation.

Ll need to click the little red" Ll want to connect everything together by pressing F3 to draw wires. Float Windowapos, ll need to zoom, l" You can do this to make selecting traces easier. Radio button and put a value of 12 in the" S peak might be difficult asis, if you want to rotate a component. Navigate to that linia node, left click the mouse then drag the probe to the negative node. If you want to plot multiple waveforms with respect to a node other than ground. Remember to press ctrlr while placing. Three of these should be to the left of the opamp and two to the right. Icon by the file menu this creates a new draft From here you can start placing and editing components.

AC Sweeps and Filter Simulation Congratulations!Something you might've noticed at this point is that the V and -V terminals on the op-amp and on two of the voltage sources in the above schematic don't have wires connecting them.LTspice should start automatically and place an icon on your desktop.

How to plot voltage drop across a specific component

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A few notes about traces when simulating: If you ever want to plot signals relative to something other than ground, you can right-click on a node on your circuit and hit "Mark Reference".