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4410: add phase param to single-tone sync e.g. 

+- 0.25 turns w.r.t the other channel, excluding I/O update mismatch
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occheung 2021-12-07 16:20:14 +08:00
parent 7265d05bae
commit 0dbf7a70c4
1 changed files with 5 additions and 3 deletions
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4410-4412.tex
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@ -432,7 +432,7 @@ def run(self):
\end{minted} \end{minted}
If the synchronization feature of AD9910 was enabled, RF signal across different channels of the same Urukul can be synchronized. If the synchronization feature of AD9910 was enabled, RF signal across different channels of the same Urukul can be synchronized.
For example, synchronized RF signal can be produced on both channel 0 and channel 1 after configuring an appropriate phase mode. For example, phase-coherent RF signal can be produced on both channel 0 and channel 1 after configuring an appropriate phase mode.
\begin{minted}{python} \begin{minted}{python}
@kernel @kernel
def run(self): def run(self):
@ -448,9 +448,11 @@ def run(self):
self.dds1.set_phase_mode(PHASE_MODE_TRACKING) self.dds1.set_phase_mode(PHASE_MODE_TRACKING)
self.dds1.set_att(6.) self.dds1.set_att(6.)
self.dds0.set(10*MHz) self.dds0.set(10*MHz, phase=0.0)
self.dds1.set(10*MHz) self.dds1.set(10*MHz, phase=0.25) # 0.25 turns phase offset
\end{minted} \end{minted}
Note that the phase difference between the 2 channels might not be exactly 0.25 turns, but it is a constant.
It can be negated by adjusting the \texttt{phase} parameter.
\newpage \newpage
\subsection{DDS RAM Modulation (AD9910 Only)} \subsection{DDS RAM Modulation (AD9910 Only)}