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We present an adaptive technique for compensating manufacturing and environmental variability in subthreshold circuits using "canary flip-flop (FF)," which can predict timing errors. A 32-bit Kogge-Stone adder whose performance was controlled by body-biasing was fabricated in a 65-nm CMOS process. Measurement results show that the adaptive control can compensate process, supply voltage, and temperature variations and improve the energy efficiency of subthreshold circuits by up to 46% compareddoi:10.1109/cicc.2009.5280882 dblp:conf/cicc/FuketaHMO09 fatcat:2yp5zbwte5ebno7oxapfwvugm4