High performance single supply CMOS level up/down shifter for multiple voltages

Abstract

A single voltage supply CMOS level shifter to up/down-conversion in the range 0.85V-1.2V is introduced. The input stage of the proposed circuit is based on a bootstrap technique for low energy consumption and high speed operation. While up-converting an input signal of 500MHz from 0.85V to 1.2V supply voltage domain, the proposed shifter enhances the energy-delay product between 65% and 31% for 0.1pF to 1pF, respectively, of capacitive load. Post-layout simulation results shown that the proposed level shifter reaches a propagation delay of 0.53ns, an energy consumption of only 4pJ, and an energy-delay product of 2.15pJns at 1pF of capacitive load to up convert from 0.85V to 1.2V.