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Triggering and Synchronization</A></TD></TR><!-- begin duo-bevel-->
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<P><SPAN class=title1>Direct Digital Synthesis (DDS) Mode (NI
5411/5431)</SPAN><BR><!--stopindex--><A
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<P>The NI 5411/5431 ARB instruments employ two broad modes for
waveform generation. <B>DDS Mode</B>, or Direct Digital Synthesis,
is one of these two modes.
<P>
<P>DDS is a technique for generating, under digital control, an
analog frequency source from a single reference clock frequency. The
primary advantages of DDS are very fine frequency resolution along
with rapid and phase-continuous frequency switching. Using DDS mode
is roughly analogous to setting a desktop function generator to
produce a single waveform and then tweaking the frequency knob at
precisely known time intervals.
<P>
<P>You should use DDS mode when you need to repeatedly generate a
single waveform and arbitrarily change its frequency without
introducing phase discontinuities. The waveform may be a "standard"
function, such as a sine, square, or triangle wave. It may also be
an arbitrary user-defined waveform. DDS is ideal for maximizing
frequency control over a single waveform. However, if you need
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