4410-4412/RAM: replace screenshot with plot

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occheung 2021-12-22 17:14:57 +08:00
parent 1ce032605a
commit 4b3f0c5612
2 changed files with 33 additions and 1 deletions

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@ -476,7 +476,7 @@ Note that the phase difference between the 2 channels might not be exactly 0.25
It can be negated by adjusting the \texttt{phase} parameter. It can be negated by adjusting the \texttt{phase} parameter.
\newpage \newpage
\subsection{DDS RAM Modulation (AD9910 Only)} \subsection{Periodic RF pulse (AD9910 Only)}
This examples demonstrates that the RF signal can be modulated by amplitude using the RAM modulation feature of AD9910. This examples demonstrates that the RF signal can be modulated by amplitude using the RAM modulation feature of AD9910.
By default, RAM profiles are programmed to profile 0. By default, RAM profiles are programmed to profile 0.
@ -533,6 +533,38 @@ The generated RF output of the above example consists of the following features
\item Go back to item 1. \item Go back to item 1.
\end{enumerate} \end{enumerate}
The expected waveform is plotted on the following figure. The expected waveform is plotted on the following figure.
Note that phase of the RF pulses may drift gradually.
Urukul was operated with a 50$\Omega$ termination to produce the waveform.
\begin{tikzpicture}[
declare function={
func(\x)= (\x<0) * (0) +
and(\x>=0, \x<2) * (0.42*cos(deg(10*pi*\x))) +
and(\x>=2, \x<3) * (0) +
and(\x>=3, \x<4) * (0.42*cos(deg(10*pi*\x)))) +
and(\x>=4, \x<7) * (0) +
and(\x>=7, \x<7.5) * (0.42*cos(deg(10*pi*\x)));
}
]
\begin{axis}[
axis x line=middle, axis y line=middle,
every axis x label/.style={
at={(ticklabel* cs:1.05)},
anchor=west,
},
every axis y label/.style={
at={(ticklabel* cs:1.05)},
anchor=south,
},
height=5cm,
width=16cm,
ymin=-0.5, ymax=0.5, ytick={-0.42,0.42}, ylabel=Voltage ($V$),
xmin=-0.5, xmax=7.5, xtick={0,...,7}, xlabel=Time ($\mu s$),
]
\addplot[blue, samples=1000, domain=-0.5:7.5]{func(x)};
\end{axis}
\end{tikzpicture}
\begin{figure}[h] \begin{figure}[h]
\centering \centering

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