![]() First, they isolate the node name in the User Circuit from the node names in the. The Voltage Controlled Voltage Sources (E100, etc.) serve two functions. Note, the figures can be seen with much greater detail if opened in a separate tab. This example has four channels, but it could have from 1 to 65535 channels. The schematic shows a User Circuit connected to the recorder. Here is a general-purpose recorder that can be added to circuits. A list of the nodes in the schematic to record. 10K - The number of samples per simulated second.Think analog-to-digital converter resolution. We are going in a totally different direction. That example is appropriate for creating a WAV file that can be played back as audio. I have deliberately not used the example from LTSpiceHelp. wave Circuit_Data.wav 16 10K V(ab) V(cd) V(ef) V(gh) Also, I could not verify the number of sampling bits beyond around 24 bits.Īll this is done by putting a. My tests found the maximum samples per second to be about ½ of the value in the table with a Transient simulation running for 10 nanosec. Wow! Imagine an actual data recorder with over 60,000 channels, 32-bit analog-to-digital conversion, and over one billion samples per second. This table summarizes the specifications from LTSpiceHelp To me, this is a good format for a general-purpose, multi-channel data recorder. Way beyond what music recording could require. However, the number of channels can be very large. Also, the data is organized into channels like you would expect in a music recording studio. Apparently, in the music industry, it is the ultimate for high-quality recording. You put a number in, you get the same number out. One key thing to know is WAV files are not compressed. I did not understand what this meant until looking at the detailed LTSpice specification and seeing how these specs aligned with low-level details of the WAV file format. In this article, examples of general purpose recording and playback circuits and details of the data format are explored.Īn intriguing capability of LTSpice is recording Transient simulation data as WAV files. The data can be read back by voltage and current sources and used as inputs to other LTSpice circuits, viewed using a simple playback circuit or exchanged with common data analysis applications. LTSpice has the capability to record data from voltage and current nodes as part of a transient simulation. LTSPICE FOR MAC HOW TOWith a little "detective" work, you might even figure out which model is different, and why.Learn how to interface with LTSpice using WAV files. This experiment might help you determine whether the 4kHz-versus-10kHz difference is due to the models, or the program itself. After running a simulation of a netlist file, you can't plot waveforms by clicking on points in the schematic, but you can plot them if you know their names. LTSPICE FOR MAC PCOr, open the flattened netlist from the Mac in LTspice on the PC and run a simulation there, and compare the results. Once on the PC, you could compare that netlist with one generated on the PC from the same schematic. Then move the Flattened Netlist file from the Mac to the PC. Then tell it to generate a Flattened Netlist (on the PC, right-click within the Netlist file window and that is one of the choices). On the Mac, tell LTspice to view the SPICE Netlist of your circuit. I don't know if the Mac version has the same capabilities, so I don't know if this works. There is very little that we know about LTspice's binary models. But LTspice also has two types of encrypted models, and it's possible that one of those types (the binary ones) MIGHT not be the same in the Mac and PC versions. Hopefully they should work on either platform. LTSPICE FOR MAC UPDATEI think it MIGHT be possible to copy LTspice's library of models from a PC to a Mac, and that MIGHT be a way to bring them fully up to date even though the Mac's Update is 'broken'. It's disappointing that the Mac version "takes back seat" to the PC version, but it has been like that for a long time. So, you might be stuck with the models that it has in it when it is installed. But I thought I read (several weeks ago, maybe many months ago) that the Mac version would not "Update" correctly for a while. Marcos, I do not use the Mac version of LTspice. ![]()
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