However, in recent years, theĭemand for power sensitive designs has grown significantly. Introductionĭigital VLSI system design space, considerable attention has been given to theĭesign of high-performance microprocessors. This paper identifies the suitable candidates for subthreshold operation at device and circuit levels for optimal subthreshold circuit design and provides an effective roadmap for digital designers interested to work with ultra low-power applications. This paper deals with various device and circuit design challenges associated with the state of the art in optimal digital subthreshold circuit design and reviews device design methodologies and circuit topologies for optimal digital subthreshold operation. Therefore, subthreshold circuit design is very promising for future ultra low-energy sensor applications as well as high-performance parallel processing. Logic can be further minimized while improving its performance. It has also been shown that by optimizing the device structure, power consumption of digital subthreshold In recent years, subthreshold operation has gained a lot of attention due to ultra low-power consumption in applications requiring low to medium performance.
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