Power-supply current diagnosis of VLSI circuits

This paper presents a technique based upon the power supply current signature (PSCS) which allows testing of mixed-signal systems, in situ. The PSCS contains important information concerning the operational status of the system; such information can be extracted using approaches based on statistical signal detection theory. The fault-detection performance of these techniques is superior to that achieved through autoregressive modeling of the PSCS. These methods are suitable for production testing of cost-sensitive devices and field testing of mission-critical systems