Is it possible to create a signal in LTSpice by using a stored data?

Question

I have lots of sampled voltage signals data where I can plot them in MATLAB or write them to a text file for each sample.

I would like to use these samples to generate input signals in LTSpice instead of trying to mimic them.

Is it doable in LTSpice?

edit: My data samples on txt can be in the following format:

59.7435 5.0615

59.7437 5.0578

59.7440 5.0768

59.7443 5.1119

Where the first column is time stamps in seconds, and the second column is corresponding sampled voltages

Jasen Слава Україні · Accepted Answer · 2016-03-02 10:22:49Z

2

If you can format the matlab data as a series of timestamps and levels you can use the PWL file option for a voltage or current source.

answered Mar 2, 2016 at 10:22

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\$\begingroup\$ I edited my question. \$\endgroup\$
– user16307
Commented Mar 2, 2016 at 10:36

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pipe · Accepted Answer · 2016-03-02 12:09:29Z

0

If your data is uniformly sampled, which it looks like it is, I would personally use the function in LTspice to read WAVE files.

To use it, add a voltage source to your circuit and as the voltage expression you enter:

wavefile="C:\path\to\your\file.wav" chan=0

This will reproduce the sampled signal efficiently with minimum storage space.

answered Mar 2, 2016 at 12:09

pipe

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\$\begingroup\$ not wave file mine are txt files \$\endgroup\$
– user16307
Commented Mar 2, 2016 at 12:45
\$\begingroup\$ @user16307, then you can translate your data into a wav file. You should be able to do this in Matlab or whatever programming language you like, with a little research on the WAV format. \$\endgroup\$
– The Photon
Commented Mar 2, 2016 at 17:09
\$\begingroup\$ why would i convert to wav if LTspice can already read txt? \$\endgroup\$
– user16307
Commented Mar 2, 2016 at 17:26
\$\begingroup\$ wav files (may) use less disk space, this could be a game changer for complicated signals. \$\endgroup\$
– Jasen Слава Україні
Commented Mar 4, 2016 at 0:02
\$\begingroup\$ @user16307 Because you used the expression write them to a text file, I assumed that you had the data in some kind of raw, non-text format, and to make a text file you had to convert it anyway. If the dataset is tiny, and already in a file format that PWL can read, there's no need to convert it. \$\endgroup\$
– pipe
Commented Mar 4, 2016 at 3:21

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2 Answers 2