LT Spice exporting a waveform...

[John Larkin]

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a
stairstep waveform. I can clean up the glitches with a sample/hold.
I\'m clocking at 1 Hz. That works.

I can export the waveform, but Spice picks the sample rate, and I get
multiple data points per waveform step.

Is there some way to plot and export one point per second, namely
every waveform step?

Later, I\'ll have all 14 counter bits drive a mess of switches in a
messy circuit, and I\'ll want to export the result of that, then sort
and process with other software.

 

[John May]

On Tuesday, August 1, 2023 at 8:15:10 PM UTC+1, John Larkin wrote:

Imagine a 14-bit ripple counter driving an R-2R DAC, to make a
stairstep waveform. I can clean up the glitches with a sample/hold.
I\'m clocking at 1 Hz. That works.

I can export the waveform, but Spice picks the sample rate, and I get
multiple data points per waveform step.

Is there some way to plot and export one point per second, namely
every waveform step?

Later, I\'ll have all 14 counter bits drive a mess of switches in a
messy circuit, and I\'ll want to export the result of that, then sort
and process with other software.

Add Tstep to .TRAN and disable waveform compression, or use ltsputil from the lTspice group.

 

[John Larkin]

On Tue, 1 Aug 2023 12:45:52 -0700 (PDT), John May <sunaeco@gmail.com>
wrote:

On Tuesday, August 1, 2023 at 8:15:10?PM UTC+1, John Larkin wrote:
Imagine a 14-bit ripple counter driving an R-2R DAC, to make a
stairstep waveform. I can clean up the glitches with a sample/hold.
I\'m clocking at 1 Hz. That works.

I can export the waveform, but Spice picks the sample rate, and I get
multiple data points per waveform step.

Is there some way to plot and export one point per second, namely
every waveform step?

Later, I\'ll have all 14 counter bits drive a mess of switches in a
messy circuit, and I\'ll want to export the result of that, then sort
and process with other software.

Add Tstep to .TRAN and disable waveform compression, or use ltsputil from the lTspice group.

Cool. I\'ll try those.

I\'m basically trying 16K possible circuit configurations and want to
export one data point, a resistance, for each one. Another program
will sort the list and pick some good ones.