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Three key requirements for wearable healthcare and biomedicai devices are the mechanical flexibility, the wireless interface, and the energy autonomy, because unobtrusive and maintenance-free devices are needed for the constant monitoring of vital human health data. Previously reported flexible healthcare and biomedicai devices, however, requires wired connection [1,2] or wireless power transmission...
Scaling power supply voltages (VDD's) of logic circuits down to the sub/near-threshold region is a promising approach to achieve significant power reductions. Circuit delays in the ultra-low voltage region, however, are extremely sensitive to process, voltage, and temperature (PVT) variations, and hence, large timing margins are required for worst-case design. Since such large timing margins reduce...
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...
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