[SI-LIST] Re: EMC Analysis
- From: "Hassan O. Ali" <hassan@xxxxxxxx>
- To: weirsi@xxxxxxxxxx, darshanmehta2k@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 13 Mar 2006 13:02:04 -0500
Steve,
I think you assumed that Darshan's numbers are for E-field in dBuV/m (usually
used for
EMI purposes) rather than radiated power.
If the two measured E-field magnitudes are of the same polarity (spacial vector
direction e.g. both directed in the vertical, up direction) and same temporal
(time)
phase (e.g. 30 degrees), at the far-field measurement point, then indeed the
total
radiated E-field level at that point is the linear sum of the two E-field
values.
However, the total radiated power will not be a linear sum of the two radiated
power
levels, since radiated power is proportional to the square of the E-field
magnitude.
(|E1|^2 + |E2|^2) not necessarily equal to |E1 + E2|^2
Best regards.
Hassan.
On Mar 13, steve weir <weirsi@xxxxxxxxxx> wrote:
>
> Typo, 106.2 not 105.2
> At 07:03 AM 3/13/2006, steve weir wrote:
> >Darshan, sum the power in linear form, and convert back to dB. I get
> >105.2dB.
> >
> >Steve
> >At 06:55 AM 3/13/2006, Darshan Mehta wrote:
> >> Hello Everybody,
> >>
> >> I have one very basic question about EMC Analysis. If we have 2
> >> nets in design, CLK1 and CLK2, both switching at 200 MHz. If we
> >> see Electro-Magnetic radiation of 100 dB from CLK1 and 105 dB
> >> radiation from CLK2, what will be the EMI radiation level at
> >> System level? Thanks in Advance!
> >>
> >> Best Regards,
> >> Darshan Mehta
> >>
> >>
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