Re: VCO Phase noise: consequence for mixing...

On 1 Sep 2005 00:27:19 -0700, "Chromatik" <france.suisse@xxxxxxxxx> wrote:

>Hi, there!
>I'm new on this board, and maybe I'm veryy close to rules, so sorry in
>advance!
>My question, despite its simplicity, is rather head breaking: I'm
>trying to understand and quantify the consequence of phase noise, due
>to a VCO, when injected in a mixer.
>As I think this phase noise could be assimilated as a coloured noise,
>so a gaussian SPD, I don't really imagine what could happen going
>through mixing process: a white noise??
>Then, is it possible to quantify the consequence of this phase noise on
>the mixer's sensibility?
>
>Sure you could teach me some, and it'll be very kindfull.
>Thanks in advance!
>
>Mike
>
>PS: sorry for my unperfect english!

downconverting improves phase noise that's why offset PLLs are so popular...



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  • Re: VCO Phase noise: consequence for mixing...
    ... My question, despite its simplicity, is rather head breaking: I'm trying to understand and quantify the consequence of phase noise, due to a VCO, when injected in a mixer. ... I expect you can se that mixing doesn't change the shape of the spectrum of a frequency-modulated signal, so it doesn't change the spectrum of phase noise. ... a god designed evolution by natural selection. ...
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