Gerard Billiot’s research while affiliated with Cea Leti and other places

The influence of the power-clock generator on the global energy-performance relationship of nanoelectromechanical (NEM) switch-based quasi-adiabatic logic circuits is investigated in this paper. This investigation is undertaken the capacitor bank type generator, it is found that the leakage current of the MOSFET switching devices used within the generator constitutes an important source of performance degradation. Capacitor type generators are found to be most efficient for low operating frequencies (less than a MHz).

In this paper, a detailed analysis and comparison of nanoelectromechanical systems (NEMS) and CMOS technologies for low power adiabatic logic implementation is presented. Fundamental limits of CMOS-based adiabatic logic are identified. Analytic relations describing the energy-performance for sub-threshold adiabatic logic are also explicitly derived and optimized. The interest of combining NEMS technology and adiabatic logic is described, and the key NEMS switch parameters that govern the dissipation-performance relationship are identified as the switch commutation frequency, its actuation voltage, and the contact resistance between the switch electrodes. Furthermore, NEMS-based adiabatic gates architectures are described. Finally, the contribution of the power-clock or energy recovery generator is estimated in order to compare CMOS and NEMS-based adiabatic architectures at the system level. The paper concludes with a detailed comparison of the energy-performance of the different explored technologies.