5432: add additional plots

https://github.com/sinara-hw/Zotino/issues/21
Step response & FEXT.

5432.tex

@@ -187,6 +187,28 @@ Output noise are measured after 15 cm IDC cable, IDC-SMA, 100 cm coax ($\sim$50
 \end{threeparttable}
 \end{table}
 
+\newpage
+
+\begin{figure}[h]
+    \centering
+    \includegraphics[width=3.3in]{zotino_step_response_rising.png}
+    \caption{Step response (switching from -10V to +10V)}
+\end{figure}
+
+\begin{figure}[h]
+    \centering
+    \includegraphics[width=3.3in]{zotino_step_response_falling.png}
+    \caption{Step response (switching from +10V to -10V)}
+\end{figure}
+
+\begin{figure}[hbt!]
+    \centering
+    \includegraphics[width=3.3in]{zotino_fext.png}
+    \caption{Step crosstalk}
+\end{figure}
+
+\newpage
+
 \section{Example ARTIQ code}
 The sections below demonstrate simple usage scenarios of the 5432 Zotino card with the ARTIQ control system.
 They do not exhaustively demonstrate all the features of the ARTIQ system.