LTspice® is a powerful, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the. LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of. LTspice is a SPICE-based analog electronic circuit simulator computer software, produced by semiconductor manufacturer Analog Devices. It is the most widely distributed and used SPICE software in the industry. Though it is freeware, LTspice is not.
|This tutorial will cover the basics of using LTspice IV, a free integrated circuit simulator, lt spice. Linear Technology updates these packages so check the website for updates. I linked the
spice because this is the version I will be using for the tutorial, lt spice.
One of our customers tested it out with Ubuntu, lt spice. You can spice out their spice post for more information. Once you open an instance of LTspice IV check out the video below to see how to get started navigating through the menu, setting your schematic and waveform preferences, adding a new schematic, lt spice, placing parts and organizing your schematic and finally running a simple DC operating point on a voltage divider.
The Simulator Directives are your Dot commands, lt spice. The help menu will show you the syntax and give descriptions for each one, lt spice. Specific commands will be covered one-by-one in future videos. If you are having trouble getting one or more to work please head over to the forum.
Labels - Turn to page 23 to see how to label values such as using 8k instead of Simulation: Transient Analysis A time domain transient analysis is where a parameter such as a spice or current is plotted against time,
lt spice. If you are looking at an spice you can see the behavior over a specified length of time, lt spice. For this spice we are spice simulate the output of a half-wave rectifier.
For this spice of analysis we will cover how to add an AC spice source to your schematic and choose a specific diode. Simulation: AC Analysis Ac analysis provides the frequency response of your circuit, lt spice.
The output waveform will be a bode plot showing you the amplitude and phase across a specified frequency range. There are several options with AC analysis, lt spice,
lt spice. You can spice frequency response as a bode plot, lt spice, on the Cartesian coordinate plane with the real and imaginary axis and you can view it as a Nyquist plot. We are going to build a passive, lt spice, first order, low-pass filter and see what information can be obtained about the circuit from the plot.
On all schematics of SparkFun's parts we give you a voltage range for which the product can safely operate.
I thought it would be a good idea to check a Sparkfun product to see just how accurate those spice ranges are. For this example we are going to look at the Electret Microphone Breakout Board, lt spice. Simulation: Noise Noise
spice let you view the noise inherent in your system as well as injected noise from outside source when modeled properly,
lt spice. Noise is most commonly concerning in op-amp circuit where precision is. For example, a battery management system using op-amps to sense the current.
Charging cycles of rechargeable batteries as well the load current are very important parameters to spice for the overall health of the battery and safety of the user. A noisy op-amp circuit may skew that current reading and cause unwanted effects such as incorrect spice readings on the microcontroller which
spices the battery from being over or under current.
I'm sure an audio spice would have been
spice to use. But you get the idea, lt spice, spice can be bad
spice it is unwanted. We are spice to continue using the pre-amplifer spice from the Electret Mic Breakout Board and run a noise analysis. Simulation: DC Transfer The DC Transfer function calculates the low frequency gain and the input and output resistances of your circuit.
Continuing with the Electret Mic Breakout Board product as our example we can first compute the transfer function, lt spice. This circuit should have low output impedance because we want op-amps to operate like ideal voltage sources, lt spice. This ensures maximum power is delivered at the output giving your ADC the best values. The closer the output impedance is to zero the better. Similarly we want the spice impedance to be high as to not draw current from the source,
Let's sim the transfer function and verify it has been designed accordingly. A model consists of a subcircuit and a symbol. For an example,
lt spice, we are going to build a model for a potentiometer. It will be based off the SparkFun 10k trimpot, lt spice. A few months ago I designed a soldering kit for personal use based off the timer.
LTspice does not come with a standard potentiometer so we will build one, lt spice. Most of the time simulating a trim-pot as a resistor is fine, lt spice. But I plan on giving this kit to new students of electronics and want them to understand the difference between a resistor symbol and its use and a potentiometer symbol and how it is used in this spice. See the video below to create your own potentiometer model in LTspice.
I have found one particular method to be the fastest and easiest for importing models and subcircuits. Eventually, I will add another video on the Forum on how to do this spice ways, lt spice. If you have a way that works for you, please share on the spice. If you are spice
spice using a specific method just ask on the spice and I spice respond with a video,
lt spice. Here you can ask questions, post solutions,
lt spice, get example circuits from the tutorial, see new videos every week and find a community for LTspice, lt spice.
I know that there are spices forums out there for LTspice but there is something awesome about a fresh forum. Here are some video tutorials put on by Linear Technology, lt spice.
This list will be updated periodically.❷