Adiabatic Logic and Subthreshold CMOS Circuit Design Using Opensource Software

Abstract

Adiabatic circuits use a varying voltage source allowing for the energy to flow back and be reused, reducing power consumption. A subthreshold circuit is a circuit which operates at below transistor threshold voltages, which is the voltage it takes for the transistor to switch on. Multiple blocks using subthreshold CMOS and adiabatic were designed and simulated in ltspice and Xscheme using the opensource Skywater 130nM PDK. These blocks include baseline subthreshold D Flipflop, 1 Mhz subthreshold integrated oscillator, sub adiabatic modulo 10 divider (order of magnitude lower power than conventional Boolean approach), adiabatic phase generator, low power relaxation oscillator. These blocks can be combined to form a lower power system.