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ATPG patterns of a digital sequential circuit contain temporally and spatially ordered bits as well as random (or don't care) bits. We synthesize BIST hardware that mimics these characteristics by controlled mixing of spectral components and noise. A Hadamard digital wave generator circuit produces all required spectral sequences and a weighted pseudorandom bit generator provides random bits. While these two blocks serve the entire circuit under test, specific to each primary input are twodoi:10.1109/ats.2008.64 dblp:conf/ats/YogiA08 fatcat:mg6vgcpx2jfyxfthqbgchqhu34