Patent ID: 6342398
Filing Date: 2002-01-29
Classification: G01R

Abstract:
A method of backside emission analysis for packaged BGA chips, comprising the steps of:providing a BGA device having a backside and a front side, said BGA device comprising a printed circuit board having a first surface and a second surface in addition to comprising a molded plastic part having a first surface and a second surface, said second surface of said printed circuit board being in contact with said first surface of said molded plastic part, said molded plastic part comprising a BGA chip having a backside and a front side in or on the surface of said front side of said BGA chip having been created semiconductor circuits, said BGA device having a grid of contact balls mounted on said first surface of said printed circuit board said second surface of said printed circuit board having points of electrical contact that are in electrical contact with points of electrical contact that have been provided in said first surface of said molded plastic part, said points of electrical contact that have been provided in said first surface of said molded plastic part being in contact with said semiconductor devices that have been provided in or on the front side of said BGA chip; providing a BGA device carrier; exposing the backside of said BGA chip, then; splitting said BGA device into two parts by physically removing said printed circuit board substrate from said molded plastic part; and performing BGA chip analysis.