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Altera_Forum
Honored Contributor
Honored ContributorNCO Frequency modualtion
Hi, I am trying to make a frequency sweeper with an NCO. Can anyone tell me how the modulation input into the NCO works. I want it sweep from 1MHZ to 48MHZ? Thank you in advance.
Altera_ForumHonored Contributor
Honored ContributorHi,
You are right. Tuning word becomes the internal increment value for the NCO's modulo adder. A small increment value leads to low frequency and a large value leads to higher frequency. At the extreme an increment of 1 will need 2^32 clocks to finish one sinusoid cycle(full modulo adder cycle). Sorry I was rushing at the end of a hard working day, good excuse
