Assume you have a VCO @10GHz with a certain amount of phase noise @X kHz. then you divide the signal coming from the VCO by 2 with a noiseless divider.
Is the noise @X kHz of your divided signal (@5GHz) is reduced due the division?
You can view it like this. Jitter is remaining same. As no noise is added and time period is doubled. So Phase noise is half. As same jitter for bigger period will translate to smaller noise
Is it correct to say that by divided the VCO frequency by a N divider, the VCO phase noise a frequency offset N*f from the carrier will become the Phase noise of the signal after division at a frequency offset f (N*f/N) from the carrier?
Thanks for your explanations.
From the deansbook on pll I read that N-counter value is the parameter which has largest impact on the Phase noise of a pll. The smaller this value is better the phase noise should be, as N values multiplies the noise.
Now I am using N=40.. Can you pls tell me , how large is my N value. To what extent this value affects my phase noise?