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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 Contributor --- Quote Start --- i'm not sure why a counter wouldn't work for what you're trying to do. you can just reset the counter to the minimum phase increment value needed when it reaches the maximum needed. the rate at which you update the counter would be inversely proportional to the sweep time of the oscillator. --- Quote End --- Good thinking, if you start with a value that produces tuning word for 48MHz then increment by the step and rollover at tuning word that produces 1MHz
