Embedded power supply for low-power DSP
IEEE Transactions on Very Large Scale Integration (VLSI) Systems - Special issue on low power electronics and design
Optimal Supply and Threshold Scaling for Subthreshold CMOS Circuits
ISVLSI '02 Proceedings of the IEEE Computer Society Annual Symposium on VLSI
A variation tolerant subthreshold design approach
Proceedings of the 42nd annual Design Automation Conference
Energy Optimization of Subthreshold-Voltage Sensor Network Processors
Proceedings of the 32nd annual international symposium on Computer Architecture
Analysis and mitigation of variability in subthreshold design
ISLPED '05 Proceedings of the 2005 international symposium on Low power electronics and design
Variation-driven device sizing for minimum energy sub-threshold circuits
Proceedings of the 2006 international symposium on Low power electronics and design
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Subthreshold logic is showing good promise as a viable ultra-low-power circuit design technique for power-limited applications. For this design technique to gain widespread adoption, one of the most pressing concerns is how to improve the robustness of subthreshold logic to process and temperature variations. We propose a variation resilient adaptive controller for subthreshold circuits with the following novel features: new sensor based on time-to-digital converter for capturing the variations accurately as digital signatures, and an all-digital DC-DC converter incorporating the sensor capable of generating an operating operating Vdd from 0V to 1.2V with a resolution of 18.75mV, suitable for subthreshold circuit operation. The benefits of the proposed controller is reflected with energy improvement of upto 55% compared to when no controller is employed. The detailed implementation and validation of the proposed controller is discussed.