[SI-LIST] Re: TDR measurement

Giuseppe-

If you can't establish a current loop for whatever reason I wonder how
you expect to determine an inductance value. When you send the incident
TDR pulse into the package net a return current path must exist in order
to determine the inductance.

This is not required for your capacitance measurement since voltages as
opposed to currents are involved.

Regard,

-Ray

Raymond Anderson
Senior Signal Integrity Staff Engineer
Product Technology Department
Advanced Package R&D
Xilinx Inc.


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Giuseppe DABUNDO
Sent: Friday, April 14, 2006 7:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] TDR measurement

Hi All,
I'm currently working to measure parasitics of a BGA Package's nets=20
(RLC)  by TDR measurements.My package is mounted on a board and i=20
performed two measure :a first one on a board with empty socket and the=20
second one with the package inside the socket.At the moment I have=20
measured only the value of capacitance using a method suggested in some=20
application notes of TDA Systems.

http://www2.tek.com/cmswpt/tidownload.lotr?ct=3DTI&cs=3DApplication+Note&=
ci=3D
3049&lc=3DEN&wt=3D480&wtwi=3D3049&wtla=3DEN&wtty=3DTI&wtsty=3DApplication=
+Note&wtpt=3D
DOWNLOAD&wtsize=3D866+KB&wtver=3D1.0&wtcat=3Dtektronix&wtnbrp=3D0&wtti=3D=
TDR+Techn
iques+for+Characterization+and+Modeling+of+Electronic+Packaging+

My problem is that i haven't a 'short' either at level board and inside=20
the package(it's a major problem because i can't connect wire bond to=20
ground);in other words i have all net open-ended.
I would like to know if another method to measure L and R without a=20
'short' reference  exists .

Thanks

                   Giuseppe

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