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

  • From: "ben chia" <bchia@xxxxxxxxxxx>
  • To: <tom@xxxxxxxxxxxxxxxxx>, "'Si-List'" <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 9 Oct 2014 15:23:41 -0700

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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