% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}
    \draw(0,0)
        node[anchor=east](){Q}
        to [short, o-] ++(1,0)
        node[inputarrow](){}
        node[mixer, box, anchor=west](mixq){};
    \draw(mixq.north)
        node[inputarrow, rotate=-90](){}
        to [short] ++(0,1)
        node [phaseshiftershape, anchor=south](phi){};
    \draw(phi.north)
        node[inputarrow, rotate=-90](){}
        to [short, name={h1}] ++(0,1)
        node [qgeneratorshape, t={G}, anchor=south](gen){};
    \draw(gen.north)
        to [short] ++(0,1)
        node [mixer, box, t={G}, anchor=south](mixi){}
        node [inputarrow, rotate=90](){};
    \draw(mixi.west)
        node[inputarrow](){}
        to [short, -o] ++(-1,0)
        node[anchor=east](){I};
    \draw(h1.center) ++(2,0)
        node[adder, box, anchor=west](add){};
    \draw(mixi) 
        -| (add.north)
        node[inputarrow, rotate=-90](){};
    \draw(mixq) 
        -| (add.south)
        node[inputarrow, rotate=90](){};
    \draw(add.east)
        to [short,-o] ++(1,0)
        node[anchor=west](){X};
\end{circuitikz}