characterizing and modeling minimum energy operation for subthreshold circuits
Subthreshold operation is emerging as an energy-saving approach to many new applications. This paper examines energy minimization for circuits operating in the subthreshold region. We show the dependence of the optimum V DD for a given technology on design characteristics and operating conditions. Solving equations for total energy provides an analytical solution for the optimum V DD and V T to minimize energy for a given frequency in subthreshold operation. SPICE simulations of a 200K transistor FIR filter confirm the analytical solution and the dependence of the minimum energy operating point on important parameters.
subthreshold circuits subthreshold model minimum energy point energy model