[SI-LIST] Re: milliohm measurement probe and cable

  • From: Scott McMorrow <scott@xxxxxxxxxxxxx>
  • To: <bchia@xxxxxxxxxxx>
  • Date: Thu, 9 Oct 2014 18:30:06 -0400

well then, you have your answer.

Scott McMorrow
TeraspeedĀ® Consulting - A Division of Samtec
16 Stormy Brook Rd
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com

On Thu, Oct 9, 2014 at 6:23 PM, ben chia <bchia@xxxxxxxxxxx> wrote:

> Hi Tom,
>
> The package resistance spec of Vdd or Vss includes all the ball/via/bumps
> in
> parallel.
>
> Thanks,
>
> Ben Chia
> High Speed Design Center
> www.HighSpeedDC.com
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of Tom Dagostino
> Sent: Thursday, October 09, 2014 11:07 AM
> To: bchia@xxxxxxxxxxx; 'Si-List'
> Subject: [SI-LIST] Re: milliohm measurement probe and cable
>
> Ben
>
> Is the vendor's spec to a single ball or the resistance through all the
> balls to the outside?
>
> Tom Dagostino
>
> Teraspeed Labs
> 9999 SW Wilshire Street
> Suite 102
> Portland, OR 97225
>
> tom@xxxxxxxxxxxxxxxxx
> www.teraspeedlabs.com
>
> 971-279-5325 office
> 503-430-1065 cell
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of ben chia
> Sent: Thursday, October 09, 2014 10:12 AM
> To: 'Si-List'
> Subject: [SI-LIST] milliohm measurement probe and cable
>
> Hi All,
>
> I try to measure the package VCC or VSS resistance to match the simulation
> report from vendor. Vendor said that the resistance should be less than 2
> milliohm from bump to ball. The setup in my lab is Agilent multi-meter ( up
> to 1 milliohm resolution, 4 wire ). I use GGB 40A 150um center pin to touch
> the bump. A 26G coax cable to connect the probe to multi-meter. The
> measured
> result is stable up to 1-2 milliohm, but resistance value is more than tens
> of milliohm. Can anyone recommend a different setup?
>
> Thanks,
>
> Ben Chia
> High Speed Design Center
> www.HighSpeedDC.com
>
>
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