LVx, a workhorse in many failure analysis laboratories, consists of laser voltage imaging (LVI) and laser voltage probing. Laser voltage tracing (LVT) eliminates the inherent restrictions bestowed by LVI and reduces the need for costly probing. It monitors a distinct feature of the test pattern and creates a corresponding signal map. This weapon in the LVx arsenal significantly decreases debug time and will prove as invaluable as LVI. Beginning with an overview of the limitations of traditional LVx, this paper provides information on the process steps, experimental setup, and applications of LVT. LVT introduces a new approach to monitoring LVx signals. The most obvious LVT application is debugging problematic peripheral NAND circuitry.

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