From 74bc8ef797b03c8cb1dc89cf1aa62ec2a6ef1494 Mon Sep 17 00:00:00 2001 From: occheung 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.