Can I use FFT to calculate signal's phase noise?

    I have collected some datas from the ADC and want to know about the
phase noise of the signal. Since the signal has phase noise , it's
time-varying signal. If I use FFT to calculate it's spectrum , I think the
result can't show the phase noise of the signal. Can you give some
recommends what means I can use to get the phase noise of the signal? 
Thanks.

agump wrote:

>     I have collected some datas from the ADC and want to know about the
> phase noise of the signal. Since the signal has phase noise , it's
> time-varying signal. If I use FFT to calculate it's spectrum , I think the
> result can't show the phase noise of the signal. Can you give some
> recommends what means I can use to get the phase noise of the signal? 
> Thanks.
> 
> 

On Mon, 26 Sep 2011 09:56:39 -0500, agump wrote:

> I have collected some datas from the ADC and want to know about the
> phase noise of the signal. Since the signal has phase noise , it's
> time-varying signal. If I use FFT to calculate it's spectrum , I think
> the result can't show the phase noise of the signal. Can you give some
> recommends what means I can use to get the phase noise of the signal?
> Thanks.

Do you know what phase noise is?

Why don't you think the FFT will help you to determine phase noise?

Do you think that, perhaps, if you were to demodulate the signal into an 
amplitude and phase component, then discard the amplitude component, that 
what was left could be used to determine phase noise?

-- 
www.wescottdesign.com

Thanks for your information. I have some knowledge about phase noise , but
have no experience how to measure that . You have gave enough hint.
Thanks.
>On Mon, 26 Sep 2011 09:56:39 -0500, agump wrote:
>
>> I have collected some datas from the ADC and want to know about the
>> phase noise of the signal. Since the signal has phase noise , it's
>> time-varying signal. If I use FFT to calculate it's spectrum , I think
>> the result can't show the phase noise of the signal. Can you give some
>> recommends what means I can use to get the phase noise of the signal?
>> Thanks.
>
>Do you know what phase noise is?
>
>Why don't you think the FFT will help you to determine phase noise?
>
>Do you think that, perhaps, if you were to demodulate the signal into an 
>amplitude and phase component, then discard the amplitude component, that

>what was left could be used to determine phase noise?
>
>-- 
>www.wescottdesign.com
>