Tabular and SI \unit comand \uA giving a weird t

Question

I just stumbled upon this weird problem using siunitx. I'm doing my report (mandatory in IEEE style), and it seem the micro prefix is giving me this strange t, inside a tabular environment. I specified in the preamble how I wanted the \per option to be like, as a division line.

On W10 through texstudio and XeLaTeX

\begin{table}[h]
    \renewcommand{\arraystretch}{1.3}
    \caption{the caption}
    \label{tab:ref-of-my-table}
    \centering
    \begin{tabular}{ll*{1}{S}l}
        \toprule
        {A} &   {B} & {Value} & {Unit}\\
        \midrule
        AA  &   & 0.46  & \unit{\volt} \\
        BB  &   & 0.6 & \unit{\volt} \\
        EE  &   & 115 & \unit{\uA \per  \volt \squared} \\
        GG  &   & 40  & \unit{\micro \ampere \per  \volt \squared} \\
        Slew rate   &   &   & \\
        Voltage swing IN    &   &   &    \\
        Voltage swing OUT   &   &   &    \\
        \bottomrule
    \end{tabular}
\end{table}

and the output is

The document and preamble

\documentclass[conference,a4paper,10pt,twocolumn,twoside]{IEEEtran}
%\IEEEoverridecommandlockouts
% The preceding line is only needed to identify funding in the first footnote. If that is unneeded, please comment it out.
\usepackage{cite}
\usepackage{amsmath,amssymb,amsfonts}
\interdisplaylinepenalty=2500       % IEEE 2 col break multiline equations
\usepackage{algorithmic}
\usepackage[italian]{babel}
    \usepackage{subcaption} % 
    \usepackage{float}
    \usepackage{subfloat}
    \usepackage{placeins}   % 
\usepackage{graphicx}
\graphicspath{./images}
\usepackage{stfloats}
\usepackage{tikz}
\usepackage[european]{circuitikz}
\usetikzlibrary{matrix,calc}
\usepackage{siunitx}
    \sisetup{
        inter-unit-product =\ensuremath{{}\cdot{}},
        display-per-mode = fraction ,
        inline-per-mode = symbol,       %% Division is "/"
        table-number-alignment = center,
        table-figures-integer = 1,
        table-figures-decimal = 2,
    }
\usepackage{textcomp}
\usepackage[T1]{fontenc}
\usepackage{pifont}
\usepackage{multirow}
\usepackage{threeparttable}
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\newcommand{\tabitem}{~~\llap{\textbullet}~~}
\begin{document}
%% Some IEEE set up, title, author, abstract
%% Usual template stuff for IEEEtran type of document
\section{my first section}
%% Some paragraphs about my report
%% The table in question
\begin{table}[h]
    \renewcommand{\arraystretch}{1.3}
    \caption{the caption}
    \label{tab:ref-of-my-table}
    \centering
    \begin{tabular}{ll*{1}{S}l}
        \toprule
        {A} &   {B} & {Value} & {Unit}\
        \midrule
        AA  &   & 0.46  & \unit{\volt} \
        BB  &   & 0.6 & \unit{\volt} \
        EE  &   & 115 & \unit{\uA \per  \volt \squared} \
        GG  &   & 40  & \unit{\micro \ampere \per  \volt \squared} \
        Slew rate   &   &   & \
        Voltage swing IN    &   &   &    \
        Voltage swing OUT   &   &   &    \
        \bottomrule
    \end{tabular}
\end{table}
%% bib file still need to be imported
\end{document}

Answer 1

With XeLaTeX, you should not use fontenc and textcomp.

If you want to comply with the standard Times font of IEEEtran, you can load newtx.

Also subcaption is not compatible with IEEEtran and you should not load it. The subfloat package does not do “subfloats” in the same sense as subcaption. If you really need subfloats, do

\usepackage[caption=false]{subfig}

The consequence of loading caption (or subcaption) is that captions will not be in the IEEEtran style.

With the corrections:

\documentclass[conference,a4paper,10pt,twocolumn,twoside]{IEEEtran}
%\IEEEoverridecommandlockouts
% The preceding line is only needed to identify funding in the first footnote. If that is unneeded, please comment it out.
\usepackage{cite}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage[italian]{babel}
%\usepackage{subcaption} % not compatible with IEEEtran
%\usepackage{float} % useless
%\usepackage{subfloat} % do you really need it?
%\usepackage{placeins} % useless in two-column format
\usepackage{graphicx}
\graphicspath{./images}
\usepackage{stfloats}
\usepackage{tikz}
\usepackage[european]{circuitikz}
\usetikzlibrary{matrix,calc}
\usepackage{siunitx}
%\usepackage{textcomp}
%\usepackage[T1]{fontenc}
%\usepackage{pifont}
\usepackage{multirow}
\usepackage{threeparttable}
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\usepackage{newtx}
\sisetup{
  inter-unit-product =\ensuremath{{}\cdot{}},
  display-per-mode = fraction ,
  inline-per-mode = symbol,       %% Division is "/"
  table-number-alignment = center,
  table-figures-integer = 1,
  table-figures-decimal = 2,
}
\newcommand{\tabitem}{\llap{\textbullet}}
\interdisplaylinepenalty=2500       % IEEE 2 col break multiline equations
\begin{document}
%% Some IEEE set up, title, author, abstract
%% Usual template stuff for IEEEtran type of document
\section{my first section}
%% Some paragraphs about my report
%% The table in question
\begin{table}[htp]
    \renewcommand{\arraystretch}{1.3}
    \caption{the caption}
    \label{tab:ref-of-my-table}
    \centering
    \begin{tabular}{ll*{1}{S}l}
        \toprule
        {A} &   {B} & {Value} & {Unit}\
        \midrule
        AA  &   & 0.46  & \unit{\volt} \
        BB  &   & 0.6 & \unit{\volt} \
        EE  &   & 115 & \unit{\uA \per  \volt \squared} \
        GG  &   & 40  & \unit{\micro \ampere \per  \volt \squared} \
        Slew rate   &   &   & \
        Voltage swing IN    &   &   &    \
        Voltage swing OUT   &   &   &    \
        \bottomrule
    \end{tabular}
\end{table}
%% bib file still need to be imported
\end{document}