SYSTEM AND METHOD FOR BUILT-IN SELF TEST (BIST) IN AN INTEGRATED CIRCUIT

摘要

Embodiments of the disclosure relate to a method and system for Built-in-Self- Test of analog signals with minimal area overhead, for measuring on-chip voltages in an all-digital manner. The method is well suited for a distributed architecture, where the routing of analog signals over long paths is minimized. A clock is routed serially to the sampling heads placed at the nodes of analog test voltages. This sampling head, present at each test node, which consists of a pair of delay cells and a pair of flip-flops, locally converts the test voltage to a skew between a pair of sub-sampled signals, thus giving rise to as many sub-sampled signal pairs as the number of nodes. To measure a certain analog voltage, the corresponding sub-sampled signal pair is fed to a Delay Measurement Unit (DMU) to measure the skew between this pair.