[SI-LIST] Re: Resonance below the fundamental frequency
- From: Mallikarjun K <malli.1729@xxxxxxxxx>
- To: bala89si@xxxxxxxxx
- Date: Tue, 22 Apr 2014 17:05:13 +0530
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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