[SI-LIST] Re: Target Impedance in PCB power plane...
- From: "Padmanaban Balamuraleedharan - TLS, Chennai" <Padmanabanb@xxxxxx>
- To: "steve weir" <weirsi@xxxxxxxxxx>
- Date: Tue, 19 Sep 2006 11:54:35 +0530
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:
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>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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