[SI-LIST] Re: Current sense resistors and power integrity
- From: "DAVID CUTHBERT" <telegrapher9@xxxxxxxxx>
- To: "Mikhail Matusov" <matusov@xxxxxxxxxxxx>
- Date: Fri, 22 Aug 2008 13:11:17 -0600
If the resistor feeds a power plane (even a relatively small one) that is
decoupled with the correct capacitors this can work well. Without the power
plane the resistor (say it's 1206 SMD) will add 2 nH in series with the
decoupling capacitor(s). All of this can be easily modeled in SPICE,
including the power plane.
Dave Cuthbert
On Fri, Aug 22, 2008 at 12:51 PM, Mikhail Matusov <matusov@xxxxxxxxxxxx>wrote:
> Hi all,
>
> Is that a really bad idea to insert a small current sensing resistor, e.g.
> 3
> mOhm, followed by a bulk capacitor in each power rail of a let's say a DSP
> or a FPGA chip to be able to measure its power consumption?
>
>
> Thanks,
> =======================
> Mikhail Matusov
> Senior Hardware Design Engineer
> Square Peg Communications
> Tel.: +1 (613) 271-0044 ext.231
> Fax: +1 (613) 271-3007
> http://www.squarepeg.ca
>
>
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