Power Issues During Test

An unintended consequence of technology scaling has increased power consumption in a chip. Without specialized solutions, level of power consumption and rate of chan-e of power consumption is even greater during test. Power delivery cry during test is somewhat limited by mechanical and electrical constraints. This chapter introduces the basic concepts related to power and energy and describes typical manufacturing test flow and associated constraints with power delivery. It also describes various types of power droop mechanisms, thermal issues, and how they interfere with the test process. Test economics issues, such as throughput and yield loss, are also discussed to further develop the low-power test problem statement.