[SI-LIST] Re: How do two Random (Gaussian) Jitter specs add?
- From: "tom_cip_11551" <tom_cip_11551@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 14 Apr 2006 16:27:29 -0000
>If two variables have a Gaussian pdf, the standard deviation of the
>combination should be the square root of the sums of the squares of
>the standard deviations of the individual variables. For example if I
> combine two noise sources, each having a Gaussian noise with 1 mV =3D
> standard deviation, the sum will have a standard deviation of 1.414
>mV.
> So, sure enough, the "P-P" value will be only 1.4 times the "P-P" of
> either original signal.
>
Thank you very much for the reply.
As you said,
"if each noise source had a Gaussian distribution with a standard
deviation of 1 mV, the sum will have a standard deviation of 1.414 mV,
and the "P-P" value will be 1.4 times the "P-P" of either original
signal."
But, what if the standard deviations are not equal? The P-P value
would not be the root mean square times either of the original.
Tom
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