\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{0mm}

\usepackage{circuitikz}

\begin{document}
\begin{preview}
  \begin{circuitikz}
    \draw (0,0) node[european and port] (myand){}
      (myand.in 1) node[anchor=east]{P} 
      (myand.in 2) node[anchor=east]{Q} 
      (1.8,0) node[european not port] (mynot){}
      (mynot.out) node[anchor=west]{S}
      (myand.out) -- (mynot.in);
  \end{circuitikz}
\end{preview}
\end{document}