Philip Covington wrote:
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
It may seem that way to you, but in real life it turns out the the DDS
generates spurs due to only approximating a sin function, clock
leakage, number of bits, etc... There is not the same issue in the
There is no fundamental reason why the the DDS sine function should be
any worse than the DSP one, nor for it to have any less bits than that
with which the signal is digitised.
It might be that commonly used DDS chips are rather old technology, and
you are comparing state of the art DSP with ten year old DDS.
NCO generated LO in the FPGA in direct sampling receivers such as
Perseus and QS1R.
--
David Woolley
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Elecraft products and more general topics related ham radio"
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