From 74bc8ef797b03c8cb1dc89cf1aa62ec2a6ef1494 Mon Sep 17 00:00:00 2001
From: occheung <dc@m-labs.hk>
Date: Mon, 6 Dec 2021 11:52:31 +0800
Subject: [PATCH] 4410-4412: add waveform for ram mod e.g.

---
 4410-4412.tex | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/4410-4412.tex b/4410-4412.tex
index a250090..f4a7be1 100644
--- a/4410-4412.tex
+++ b/4410-4412.tex
@@ -444,6 +444,7 @@ def run(self):
 
 \newpage
 \subsection{DDS RAM Modulation (AD9910 Only)}
+This examples demonstrates that the RF signal can be modulated by amplitude using the RAM modulation feature of AD9910.
 Set field \texttt{dds} as an Urukul channel, \texttt{cpld} as the corresponding Urukul CPLD.
 
 \begin{minted}{python}
@@ -479,6 +480,24 @@ def profile0_set(self):
     self.cpld.io_update.pulse_mu(8)
 \end{minted}
 
+The generated RF output of the above example consists of the following features in sequence:
+\begin{enumerate}
+    \item A 10 MHz RF pulse for 2 microseconds.
+    \item No signal for 1 microseconds.
+    \item A 10 MHz RF pulse for 1 microseconds.
+    \item No signal for 3 microseconds.
+    \item Go back to item 1.
+\end{enumerate}
+The expected waveform is plotted on the following figure.
+
+\begin{figure}[h]
+    \centering
+    \includegraphics[width=\textwidth]{ad9910_amp_mod.png}
+    \caption{RF output from DDS RAM modulation example}
+\end{figure}
+
+\newpage
+
 \section{Ordering Information}
 To order, please visit \url{https://m-labs.hk} and select the 4410 Urukul in the ARTIQ Sinara crate configuration tool.
 The default chip is AD9910 (4410 Urukul), which supports more features.