Invention Grant
- Patent Title: Testing of integrated circuit to substrate joints
- Patent Title (中): 集成电路到基板接头的测试
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Application No.: US13710884Application Date: 2012-12-11
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Publication No.: US09472131B2Publication Date: 2016-10-18
- Inventor: Mir B. Ghaderi , Shafiq M. Jamal , Sang Y. Youn
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Blakely, Sokoloff, Taylor & Zafman LLP
- Main IPC: G09G3/00
- IPC: G09G3/00

Abstract:
A method for testing integrated circuit-to-substrate joints that electrically connect an IC to a substrate. An ammeter is coupled to a test node of the driver IC, while the test node is coupled to a current source, and a measured current output of the ammeter is recorded. A voltmeter is coupled to the test node while the test node is coupled to an end node of a group of dummy IC-to-substrate joints that are daisy chained; a first measured voltage output of the voltmeter is then recorded. The IC then couples the test node to another end node of the daisy chained dummy joints, and a second measured voltage output is recorded. A resistance or admittance value for the electrical connection of the IC to the substrate is then computed, using the first and second measured voltage outputs and the measured current output. Other embodiments are also described and claimed.
Public/Granted literature
- US20140125645A1 TESTING OF INTEGRATED CIRCUIT TO SUBSTRATE JOINTS Public/Granted day:2014-05-08
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