PD/SOI CMOS Schmitt trigger circuits with controllable hysteresis

Abstract

This paper presents an SOI circuit technique, which eliminates the uncontrollable floating-body-induce hysteretic component in the transfer characteristics of CMOS Schmitt triggers. This technique integrates a successive switching threshold shift mechanism with the systematic body contact scheme. The resulting design possesses improved noise immunity and well-defined hysteresis behavior, suitable for use as a low-noise receiver, waveform-reshaping circuit, or delay element in VLSI applications.