[SI-LIST] Re: help me
- From: steve weir <weirsi@xxxxxxxxxx>
- To: zhang_kun@xxxxxxxxxx, ludwig@xxxxxxxxxxxxxxxxx
- Date: Fri, 03 Feb 2006 11:58:54 -0800
Zhangkun, leakage adds real loss which is good for some damping. The price
is increased power consumption.
Regards,
Steve
At 12:14 AM 2/4/2006 +0800, zhangkun 29902 wrote:
>Dear Stefan
>
>Thank you for the explaination.
>
>Based on the situation, there is another question. How does the leakage
>current affect the power integrity of the PCB and package? Now, I have not
>seen any paper on this topic.
>
>Best Regards
>
>Zhangkun
>2006.2.3
>
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>----- Original Message -----
>From: Stefan Ludwig <ludwig@xxxxxxxxxxxxxxxxx>
>Date: Friday, February 3, 2006 4:46 pm
>Subject: [SI-LIST] Re: help me
>
> > Jagaveer, Zhangkun,
> >
> > Zhangkun is right, 3 Ohms on a board with mounted chips is not an
> > issue.
> > The reason is because of leakage current in transistors. As
> > process
> > technology progresses (180nm -> 130nm -> 90nm ...), the leakage
> > current
> > in a transistor gets bigger. That is, a transistor, even when it
> > is
> > "off", will have some current flowing through it. Also, you can
> > pack
> > more transistors onto a chip. Therefore, you end up with tens to
> > hundreds of millions of leaky transistors, which leads to a low
> > resistance when measured with an Ohm-meter.
> >
> > Cheers,
> >
> > Stefan Ludwig
> >
> > zhangkun 29902 wrote:
> >
> > >Dear jagaveer
> > >
> > >Do not worry about the problem. I have met this kind of problem
> > for several times. When the IC is soldered on the PCB, the dc
> > resistance between power and ground is very small.
> > >
> > >However, I am not sure the reason. The IC vendor did not explain it:(
> > >
> > >Best Regards
> > >
> > >Zhangkun
> > >2006.2.3
> > >
> > >
> > >***********************************************************************
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> *****************************************************************************************>
> > >----- Original Message -----
> > >From: jagaveer25 <jagaveer25@xxxxxxxxxxx>
> > >Date: Friday, February 3, 2006 12:25 pm
> > >Subject: [SI-LIST] help me
> > >
> > >
> > >
> > >>Hi folks,
> > >>
> > >>
> > >>I have done in one PCB. It is 12 layer board
> > >>
> > >>I have used 4 digital signal processor and one field
> > programmable
> > >>gate array for this pcb .
> > >>
> > >>Dsp side I have used 3 pwr supplies
> > >>
> > >>1v
> > >>1.5v
> > >>2.5v
> > >>before I have populated that dsp I have checked between the all
> > >>pwr
> > >>supply and gnd resistance is very high resistance but
> > >>after I have populated that 3 dsp I have checked between the
> > >>1Vpwr
> > >>supply and gnd resistance is only 3 ohms
> > >>
> > >>my 1v pwr section is 20A design
> > >>
> > >>I can't understand this type of problem
> > >>Can u give any solution for this problem I have appreciate it
> > >>
> > >>Thanks
> > >>V.jagaveer
> > >>
> > >>
> > >>
> > >
> > >
> > >
> >
> > --
> >
> > Ludwig Systems Engineering Consulting - Design -
> > ImplementationWWW: www.ludwigsystems.com System
> > Architectures - FPGAs - PCBs
> > Ph/Fx: +41-43-355-58-73/74 Hardware - Firmware - Software
> >
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