Hello and happy new year 2013,
I'd like to ask a question based on pll/clock generation.
Based on this FAQ: http://tinyurl.com/ah7r5ju there is a benefit from running a VCO at very high frequency, higher than the Fpdf or Fref. But this leads to a high N value right?
Based on this pdf http://www.analog.com/library/analogDialogue/cd/vol33n1.pdf page 20, right column, it is stated that:
"Integer N synthesizers require a reference frequency that
is equal to the channel spacing. This can be quite low and thus
necessitates a high N. This high N produces a phase noise that
is proportionally high."
So, what i'm thinking of wrong?