[time-nuts] DDS - Cosine v. Sine LUT
kd0gls at mninter.net
Tue Jun 21 17:44:26 UTC 2011
With all the discussion lately regarding DDS and CORDIC, I'm reminded of a question that came up some time ago for which I've never found an answer. Perhaps you enlightened people can enlighten me.
Given a complete DDS chip with a single output channel (e.g. AD9834, AD9835), why would one device favor a cosine LUT versus a sine LUT? On the surface, starting the roller coaster ride at the top of the hill (assuming the phase accumulator starts from zero) seems odd.
Brent, KD0GLS, Minneapolis
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