Abstract

We present the design, fabrication and characterization of fully depleted silicon on insulator (FDSOI) CMOS devices and circuits for ultralow voltage operation. We have obtained symmetrical threshold voltages for N and P channel devices with an ON–OFF current ratio of 1000:1. A figure of merit of 5 fJ/stage is achieved at 0.25 V on 0.25 μm, 2-input NAND gate FDSOI CMOS ring oscillators. Polysilicon gate depletion and source–drain series resistance limit the performance of the FDSOI CMOS technology. A simplified model combined with high frequency capacitance–voltage measurements at two different frequencies is developed to determine the series resistance and polysilicon gate depletion effects.

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