[SI-LIST] Re: Target Impedance in PCB power plane...
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Padmanaban Balamuraleedharan - TLS, Chennai" <Padmanabanb@xxxxxx>
- Date: Mon, 18 Sep 2006 23:56:16 -0700
Padmanaban, yes it means what it says which is just a restatement of
Ohm's Law. If you have specifically defined loads then you can
optimize a network to meet those requirements. The normal caveats
apply as to: the actual signal content, beat frequencies, and
parallel resonance(s).
Steve.
At 11:24 PM 9/18/2006, Padmanaban Balamuraleedharan - TLS, Chennai wrote:
>Thanks Steve.
>
>That means, we can assign target impedences based on the load current
>distribution and optimize it.
>Say, I'm having 2 loads switching at different frequencies. So I can assign
>target impedence differently for the two loads based on the current
>distribution. It'll not create any problem in PDS as well as in EMC emisson
>test. Is my understanding is right?
>
>Rgds,
>Padmanaban
>
>-----Original Message-----
>From: steve weir [mailto:weirsi@xxxxxxxxxx]
>Sent: Tuesday, September 19, 2006 11:46 AM
>To: Padmanabanb@xxxxxx; silist
>Subject: Re: [SI-LIST] Target Impedance in PCB power plane...
>
>Padmanaban, the short answer is that the impedance needs to be controlled
>over the spectrum of load current that is significant. If the current
>spectrum is well known and controlled, the impedance response can be
>optimized.
>
>Steve.
>At 11:01 PM 9/18/2006, Padmanaban Balamuraleedharan - TLS, Chennai wrote:
> >Content-Transfer-Encoding: quoted-printable
> >Content-Type: text/plain;
> > charset="Windows-1252"
> >Hi all,
> >=20
> >Whether target impedance of power plane needs to be kept below certain
> >= value throughout the operating spectrum? if yes, Why? Current
> >consumption at different frequencies are different in the spectrum,
> >right? Eg, = Switching current consumption occurs at multiples of its
> >fundamental switching frequencies at different magnitudes. So we need
> >to consider the current distribution instead of switching current
> >alone. If I'm wrong, correct = me.
> >How we need to fix the threshold limit for the target impedance of the
> >= power plane throughout the operating frequency?
> >=20
> >Thanks in advance.
> >=20
> >Regards,
> >Padmanaban
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