Post processing the ngspice simulation outputs using Hspice Toolbox and matlab
Before proceeding with the postprocessing we need to note a few issues:
the raw files generated so far are in ascii format.
according to ngspice documentation, by default, the raw file should be saved in binary format,
however, this does not seem to be the case with Windows OS
the Hspice Toolbox requires the raw files to be in binary format.
unfortunately, electric's Plot Simulation Output is not able to read the latest ngspice raw binary format
there are three options:
1. give up visualizing the simulation outputs through electric and use ngspice CLI instead
in this case the most effective solution is to add the following line to the file .spiceinit.
set filetype=binary
2. start ngspice, load the simulation data, and re-save it in binary format
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3. edit the control session (.control … .endc) of the schematic (or netlist) and write the raw file both in ascii and binary format
example:
.control
...
set filetype=ascii
write ./spiceout/C5_inverter_VTC_ngsp.raw v(in) v(out) dvout VSW VIL VIH VOH VOL
set filetype=binary
write ./spiceout/C5_inverter_VTC_ngsp_bin.raw v(in) v(out) dvout VSW VIL VIH VOL
...
.endc
For the moment we will “stick” with option 2.