\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{figure}[ht]
  \centering
  \input{inverter.tex}
  \caption{\label{fig:inverter} An inverter schematic without scaling}
\end{figure}
\begin{figure}[ht]
  \centering
  \resizebox{0.6\textwidth}{!}{\input{inverter.tex}}
  \caption{\label{fig:scaledInverter} An inverter schematic without scaling}
\end{figure}
\end{document}
