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% vim: set ts=2 sw=2 noet:
\begin{circuitikz}[
]
\matrix [
row sep = 5mm, column sep = 7mm,
nodes = {
align = center,
fill = white,
},
] {
& \coordinate (vmi);
& \node[twoportshape] (B2Li) {};
&
& \coordinate (mi);
&
& \node[mixer] (Mi) {};
& \coordinate (si);
\\
\node[] (M) {\(m(n)\)};
& \node[twoportshape] (BSp) {};
&
&
& \node[twoportshape] (H) {};
& \node[oscillator] (OSC) {};
& \coordinate (phii);
& \node[adder] (SUM) {};
& \node (S) {\(s(t)\)};
\\
&&&& \coordinate (phiq);
\\[-3mm]
& \coordinate (vmq);
& \node[twoportshape] (B2Lq) {};
& \coordinate (mq);
& \node[mixer] (Mq) {};
&
&
& \coordinate (sq);
\\
};
% Add missing lables
\node at (H.center) {\large \(\mathcal{H}\)};
\node at (B2Li.center) {\textsf{B2L}};
\node at (B2Lq.center) {\textsf{B2L}};
\node at (BSp) {\textsf{BSp}};
% Add connections
\begin{scope}[thick, -latex]
\draw (M) -- (BSp.west);
\draw (BSp.north) |- (B2Li.west);
\draw (B2Li.east) -- (Mi.west);
\draw (Mi.east) -| (SUM.north);
\draw (BSp.south) |- (B2Lq.west);
\draw (B2Lq.east) -- (Mq.west);
\draw (Mq.east) -| (SUM.south);
\draw (SUM) -- (S);
\draw (OSC.east) -| (Mi.south);
\draw (OSC.west) -- (H.east);
\draw (H.south) -- (Mq.north);
\end{scope}
% Add signal labels
\node[above right] at (vmi) {\(\vec{m}_i\)};
\node[below right] at (vmq) {\(\vec{m}_q\)};
\node[above] at (mi) {\(m_i(t)\)};
\node[below] at (mq) {\(m_q(t)\)};
\node[above right] at (phii) {\(\phi_i\)};
\node[right, yshift = 1mm] at (phiq) {\(\phi_q\)};
\node[above left] at (si) {\(s_i(t)\)};
\node[below left] at (sq) {\(s_q(t)\)};
\begin{pgfonlayer}{background}
\fill[left color = white, right color = blue!20, draw = white]
($(B2Li.north) + (0,1)$) coordinate (D) rectangle ($(B2Lq.south) - (3,1)$);
\fill[right color = white, left color = red!20, draw = white]
($(B2Li.north) + (0,1)$) coordinate (A) rectangle ($(B2Lq.south) + (9,-1)$);
\node[blue!50, anchor = south east, xshift = -4mm] at (D) {\bfseries\ttfamily Digital bits};
\node[red!50, anchor = south west, xshift = 4mm] at (A) {\bfseries\ttfamily Analog waveform};
\end{pgfonlayer}
\end{circuitikz}
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