[SI-LIST] Re: [Q] IR Drop
- From: Cosmin Iorga <ci249534@xxxxxxxxx>
- To: 김기돈 <kdkim@xxxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Mon, 11 Oct 2010 09:40:26 -0700 (PDT)
Benjamin,
This is not a surprise; you probably have shared impedance on your planes for
multiple current sinks. So look at the current flow path from VRM to each sink
location and identify the plane regions where these currents overlap. On these
overlapped sections you apply Ohm's law using the sum of corresponding sink
currents and your experiment will then make sense.
Cosmin Iorga, Ph.D.
founder NoiseCoupling.com
http://www.noisecoupling.com
________________________________
From: ê¹?기ë?? <kdkim@xxxxxxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Fri, October 8, 2010 4:02:43 AM
Subject: [SI-LIST] [Q] IR Drop
Dear all mentors,
I¡¯m beginner at SI/PI area based on microwave eng¡¯g.
Currently, I¡¯m doing simple example which have one voltage source(=3.3V)
and three current sink location.
Can anyone explain to me why IR drop amplitude is bigger at which smaller
sink current passes?
Stackup
------------ Signal02 VRM-----Sink(1A)-----Sink(2A)-----
Sink(1A) : Distance from VRM
------------ PlaneVSS 3.196V 3.189V
3.187V : IR Drop
------------ PlaneVCC
------------ Signal01
Thanks and Regards,
Benjamin Kim
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