It is difficult to localize the soft defect on analog and mixedsignal ICs only by OBIRCH, because OBIRCH laser scanning module could not synchronize with the IC under functional test, and the failure modes on analog and mixed-signal ICs are complicated. In this paper, a dynamic synchronization method is proposed to localize the soft defect precisely only with an OBIRCH tool on analog and mixed-signal ICs. The methodology and system configuration are presented. A case is studied successfully on an analog and mixed-signal IC using this method.

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