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A Fast and Low Cost Embedded Test Solution for CMOS Image Sensors

Julia Lefèvre 1 Philippe Debaud 1 Patrick Girard 2 Arnaud Virazel 2
2 TEST - TEST
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier
Abstract : This paper presents a novel test solution directly embedded inside CMOS Image Sensors (CIS) to sort out PASS and FAIL dies during production test. The solution aims at reducing test time, which can represent up to 30% of the final product cost. By simplifying the way optical tests are usually applied with an ATE, the proposed Built-In Self-Test (BIST) solution overcomes the drawbacks of long test time and huge amount of test data storage. We experimented our solution by considering that roughly half of the tests usually performed with an ATE can be embedded and applied using the proposed fast and low cost BIST engine. Results obtained on more than 2,400 sensors have shown that our solution reduces test time by about 30% without impacting the defect coverage. The area cost of our solution is about 1% of the digital part of the sensor, i.e., approximately 0.25% of the total sensor area. The proposed embedded CIS test solution outperforms existing solutions in terms of area overhead and test time saving, thus encouraging its future implementation in an industrial production flow.
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https://hal-lirmm.ccsd.cnrs.fr/lirmm-03377562
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Submitted on : Thursday, October 14, 2021 - 11:17:02 AM
Last modification on : Friday, October 22, 2021 - 3:07:42 PM

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Julia Lefèvre, Philippe Debaud, Patrick Girard, Arnaud Virazel. A Fast and Low Cost Embedded Test Solution for CMOS Image Sensors. IEEE International Test Conference (ITC 2021), Oct 2021, Online, United States. In press, ⟨10.1109/ITC50571.2021.00007⟩. ⟨lirmm-03377562⟩

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