Brian,

That is the rms value of two "uncorrelated" ac voltage
sources.  

For noise, this is the way uncorrelated noise power adds.

                   - Robert -

       Robert A. Macy, PE .. m...@california.com
       408 286 3985 . . . .. . . fx 408 297 9121
       AJM International Electronics Consultants
       101 E San Fernando, Suite 402
       San Jose, CA  95112


On Thu, 18 Dec 2003 07:50:17 -0800
 "Brian O'Connell" <boconn...@t-yuden.com> wrote:
> Good People
> 
> What is the basis of this formula for working voltage ?
> 
>  sqroot(a^2 + b^2)
> 
> thanks,
> Brian



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