On-wafer integrated circuit electrical testing
First Claim
1. An electrical testing device for testing integrated circuits on a wafer, said device comprising:
- circuit means including a multilayer thin film test circuit fabricated in a flexible dielectric material, said test circuit having a plurality of conductive contacts extending therefrom for contacting contact points on circuitry on the wafer to be tested;
a dimensionally stable support material having a coefficient of thermal expansion substantially matching a coefficient of thermal expansion of said wafer located on top of said circuit means and directly above said contacts;
actuation means for forcibly contacting said support material so as to cause said conductive contacts to contact the contact points of the integrated circuit on said wafer; and
said circuit means having a plurality of conductive traces embedded within said flexible dielectric material, each of said traces being isolated therebetween and having said contacts connected thereto.
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Accused Products
Abstract
An electrical testing device is provided for testing integrated circuits located on a wafer. The testing device employs a multi-layer test circuit having a plurality of contacts for contacting the integrated circuits on a wafer. The layers of the test circuit are embedded in a flexible, supportive dielectric material which allows vertical flexing of the contacts. Cross bar switches are further employed to switch among the plurality of contacts thereby enabling the testing of individual dies of the water to be tested. A microprocessor is further included for controlling the switching and the testing of each die. In an alternate embodiment, the plurality of contacts are mechanically moved relative to the wafer to allow testing of the dies without the need for the switches.
60 Citations
18 Claims
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1. An electrical testing device for testing integrated circuits on a wafer, said device comprising:
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circuit means including a multilayer thin film test circuit fabricated in a flexible dielectric material, said test circuit having a plurality of conductive contacts extending therefrom for contacting contact points on circuitry on the wafer to be tested; a dimensionally stable support material having a coefficient of thermal expansion substantially matching a coefficient of thermal expansion of said wafer located on top of said circuit means and directly above said contacts; actuation means for forcibly contacting said support material so as to cause said conductive contacts to contact the contact points of the integrated circuit on said wafer; and said circuit means having a plurality of conductive traces embedded within said flexible dielectric material, each of said traces being isolated therebetween and having said contacts connected thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electrical testing device for testing the integrated circuits on a wafer, said device comprising:
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circuit means including a thin multilayer test circuit formed in a flexible dielectric material; said circuit means having a first plurality of conductive traces embedded in a first layer of said flexible dielectric material and isolated therebetween and having a first plurality of electrical contacts extending outward therefrom, said circuit means having a second plurality of conductive traces embedded in a second layer of said flexible dielectric material and isolated therebetween and having a second plurality of electrical contacts extending outward therefrom; a support material having a coefficient of thermal expansion substantially matching a coefficient of thermal expansion of said wafer located on top of said circuit means and directly above said contacts for providing dimensional stability to said circuit; and actuation means located on top of said support material for forcibly contacting said support material so as to cause said first and second plurality of electrical contacts to contact points of the integrated circuit on a wafer to be tested. - View Dependent Claims (14, 15, 16)
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17. A method for testing electrical integrated circuits on a wafer, said method comprising:
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providing a multi-layer test circuit having conductive traces embedded within a flexible dielectric material and a plurality of thin contacts extending therefrom; applying a substantially uniform pressure to a dimensionally stable support material having a coefficient of thermal expansion substantially matching a coefficient of thermal expansion of said wafer, wherein said dimensionally stable support material is located on top of said circuit to cause said contacts to contact the electrical contacts of the integrated circuits on the wafer to be tested; testing one die of said wafer; and switching to another die after the testing on the previous die is completed. - View Dependent Claims (18)
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Specification