% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2026
\begin{tikzpicture}
    \begin{scope}
        \begin{axis}[
            axis lines=center,
            axis line style={-Triangle},
            scale only axis,
            axis on top,
            height=1.8cm,
            width=\linewidth*\getDarcImageFactor,
            xmin=0,
            xmax=2.5*pi,
            ymin=-1,
            ymax=1,
            ticks=none,
            xlabel={$t$},
            xlabel style={anchor=north},
            ylabel={$U_\mathrm{BFO}$},
            ylabel style={anchor=east},
        ]
        \addplot[
            mark=none,
            DARCblue,
            thick,
            domain=0:2.5*pi,
            samples=1201
        ]
        {0.9*sign(sin(deg(10*x)))};
        \end{axis}
    \end{scope}
    \begin{scope}[
        shift={(0,-2.1/\getDarcImageFactor)}
    ]
        \begin{axis}[
            axis lines=center,
            axis line style={-Triangle},
            scale only axis,
            axis on top,
            height=1.8cm,
            width=\linewidth*\getDarcImageFactor,
            xmin=0,
            xmax=2.5*pi,
            ymin=-1,
            ymax=1,
            ticks=none,
            xlabel={$t$},
            xlabel style={anchor=north},
            ylabel={$U_\mathrm{ZF}$},
            ylabel style={anchor=east},
        ]
        \addplot[
            mark=none,
            DARCblue,
            thick,
            domain=0:2.5*pi,
            samples=1201
        ]
        {0.9*sign(sin(deg(10*x)))*sin(deg(x))};
        \end{axis}
    \end{scope}
    \begin{scope}[
        shift={(0,-4.2/\getDarcImageFactor)}
    ]
        \begin{axis}[
            axis lines=center,
            axis line style={-Triangle},
            scale only axis,
            axis on top,
            height=1.8cm,
            width=\linewidth*\getDarcImageFactor,
            xmin=0,
            xmax=2.5*pi,
            ymin=-1,
            ymax=1,
            ticks=none,
            xlabel={$t$},
            xlabel style={anchor=north},
            ylabel={$U_\mathrm{NF}$},
            ylabel style={anchor=east},
        ]
        \addplot[
            smooth,
            mark=none,
            DARCblue,
            thick,
            domain=0:2.5*pi,
            samples=400
        ]
        {0.9*sin(deg(x))};
        \end{axis}
    \end{scope}
\end{tikzpicture}