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Near-threshold 40nm Supply Feedback C-element

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4 Author(s)
Schwartz, I. ; Low Power Circuits & Syst. Lab., Ben-Gurion Univ. of The Negev, Negev, Israel ; Teman, A. ; Dobkin, R. ; Fish, A.

The growing demand for ultra low power applications has drawn interest in low voltage digital circuits, operating in the near-threshold region. Asynchronous circuits, operating with near-threshold supply voltages, are more attractive than their synchronous counterparts due to higher resilience to PVT variations. This paper presents a novel ultra-low power C-element, which is a basic building block in common asynchronous circuits. The proposed C-element is based on a Supply Feedback concept, implemented in a cross-coupled inverter latch. Utilization of this concept enables functionality under local and global variations down to 0.3V. The cell was designed using a standard low-power 40nm technology. Simulation results show a 5.8X-24X leakage reduction at 300mV as compared to a conventional Weak Feedback C-element operating at its minimal VDD. Monte Carlo simulations prove that the proposed cell remains fully functional under global and local process variations.

Published in:

Quality Electronic Design (ASQED), 2011 3rd Asia Symposium on

Date of Conference:

19-20 July 2011