UTMOST Log File Conversion for TonyPlot


A new feature has recently been added to UTMOST: the ability to convert UTMOST log files into a format suitable for viewing in TonyPlot. This new feature is controlled from the UTMOST Output Log File screen, and is compatible with all UTMOST plot types. The conversion process will also automatically produce the derivative data types associated with certain UTMOST routines (such as the mosfet module's ALL_DC, or the bipolar module's BF and BR).

The Output Log File screen is illustrated in Figure 1. To perform a log file conversion, the user types the name of the UTMOST logfile (eg. 'logfile') into the input field 'Source File 1', and then presses the 'TonyPlot' button. This will result in the creation of two new files with additional suffixes '.sff' and '.set'. These files should be supplied to TonyPlot with a command line of the form:

tonyplot logfile.ssf -set logfile.set


Figure 1. UTMOST log file screen.


An example of applying this procedure to data generated from a single device with the mosfet ALL_DC routine is shown in Figure 2. In this figure we can see both the 'IDvsVDS' and 'IDvsVGS' curves; we also see the 'gds', 'gm' and 'gm/ID' curves, all of which are generated automatically during the conversion process. (In fact, whether the convertor produces a 'gds' or an 'rds' derivative depends in this case on the value of the UTMOST DC Measurement screen's 'gds/rds' flag.)


Figure 2. Example of converted log file viewed in TonyPlot.

This new feature will be available in UTMOST version 12.3.14.R, and all UTMOST distributions will now include the latest version of TonyPlot. Once inside TonyPlot the plots obtained in this manner can be further manipulated at will, to take advantage of the full functionality of TonyPlot, enabling the user to select individual curves, zoom in or out, alternate between linear and log scales or simply transform the data through user-defined functions.