Realization of Programmable PRPG with Enhanced Fault Coverage Gradient

This paper describes a low power programmable pseudorandom pattern generator with desired toggling level and also enhanced fault coverage compared with other BIST based on PRPG. It comprised of finite state machine LFSR driving a phase shifter and it allows the device to produce binary sequence with preselected toggling activity. Generator is automatically controlled providing easy and precise tuning. Furthermore, this paper introduces a test compression method to avoid repeated pattern generation for testing the same device. The main highlight of this paper is to reduce the test data volume and test data memory.