Browse Prior Art Database

Open Collected Driver Noise Measurement and Analysis by Walking Active Line

IP.com Disclosure Number: IPCOM000115363D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Frech, R: AUTHOR [+2]

Abstract

Disclosed is a method, which allows to identify and to describe each single Open Collected Driver (OCD) noise contributor in a complex 3-dimensional wiring structure with its precise value of noise voltage and which explains the noise generation. This knowledge is used to feed back to the package and chip design to correct and minimize all OCD noise contributions to an absolute minimum.

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Open Collected Driver Noise Measurement and Analysis by Walking Active
Line

      Disclosed is a method, which allows to identify and to describe
each single Open Collected Driver (OCD) noise contributor in a
complex 3-dimensional wiring structure with its precise value of
noise voltage and which explains the noise generation.  This
knowledge is used to feed back to the package and chip design to
correct and minimize all OCD noise contributions to an absolute
minimum.

      The driver position of either a high or a low OCD noise value
position is picked and the driver is kept in its quiet line down or
high level.  While measuring the OCD noise only on this defined quiet
driver position, all other drivers are switched, not simultaneously,
but only one driver after each other.

      Identification of the noise values is performed by checking
into the chip and package layout and with the help of a "partial net
simulation".  Thereby, without modelling, complex delta-I
contributions caused by return current crowding at lump inductances
of the voltage and GND return paths thru viaholes and partial mesh
planes are visible just as inductive and capacitive coupling from
neighbour lines and viaholes and thru mesh planes.

      Confirmation can be achieved by the partial modelling and net
analysis which is by far less complex and can therefore be supported
by the modelling and simulation tools.  Thereby, only a single net or
some nets are modelled together with...