[SI-LIST] AW: Re: Resonance below the fundamental frequency
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 22 Apr 2014 11:57:28 +0000
There are many good books about SI-Interconnects, you can browse the SI-List
archive for Book recommendations and you will find many.
Resonances occur whenever there are discontinuities in the Signal path or it's
return path. Just simulate an impedance matched transmission line up to very
high frequencies, and you will see a nice linear transmission S-Parameter. Now
change the impedance of the source and the Sink and there is your resonator.
Depending on the length of the trace, there will be at least one suckout in the
transmission S-Parameter.
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Mallikarjun K
Gesendet: Dienstag, 22. April 2014 13:35
An: bala89si@xxxxxxxxx
Cc: Istvan Novak; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Resonance below the fundamental frequency
Hi,
I am not sure i can ask this question here or not?
Can anybody give more details about Interconnect resonance.
whether it is about the microstrip or stripline transmission line resonaces.
How resonance will occur in these transmission lines.
Any documents/material will be also helpful for reference.
On Mon, Apr 21, 2014 at 5:52 PM, Balaji G <bala89si@xxxxxxxxx> wrote:
> Thanks Istvan :) Clear explanation :)
>
> On Mon, Apr 21, 2014 at 5:42 PM, Istvan Novak
> <istvan.novak@xxxxxxxxxxx
> >wrote:
>
> > Hi Balaji,
> >
> > As always, it depends :-) .
> >
> > The resonance will not cause any problem IF the signal is truly
> > periodical with 667MHz fundamental frequency, like a clock signal,
> > (or the data stream is properly band limited, see below) and IF
> > there is no potential aggressor signal in the spectrum of the
> > resonance. For data-like signals, coding may limit the low end of
> > the spectrum to be above the resonance frequency, however, there are
> > still a few important scenarios to consider: out-of-band
> > communications, training sequences and negotiating sequences
> > temporarily may occupy the spectrum around the resonance,
> > potentially causing failures; moreover uncorrelated aggressor
> > signals may have spectral content around the resonance and the
> > resulting noise may stress the common-mode range of the connected
> > devices.
> >
> > Regards,
> >
> > Istvan Novak
> > Oracle
> >
> >
> >
> >
> > On 4/21/2014 7:34 AM, Balaji G wrote:
> >
> >> Hi all,
> >> A square wave will have sinusoidal wave at the odd multiples of
> >> fundamental frequency. Say if a square wave having frequency of
> >> 667MHz with the maximum significant sine wave at a frequency of
> >> 2GHz (Rise time - bandwidth relationship) transmitted over an
> >> interconnect which has resonance at 400MHz, will it affect the
> >> signal quality?
> >>
> >> In simpler words, If the resonance occurs at the frequency below
> >> the fundamental frequency, does the signal quality gets affected?
> >>
> >> Regards,
> >> Balaji
> >>
> >>
> >>
> >>
> >
>
>
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