Mixed signals technique for offset reductions

Abstract

This article, discusses the problem with the influence of offset voltages and their drives generated in the measuring system in the process of forming a digital equivalent to a pre-formed value. A method and a schematic solution are proposed to reduce the total offset voltages in a measuring line, based on the mixed signal technology. Its limitations have been defined in relation to transformation time intervals and generated internal parasitic charges. It's explored a methodology for the construction of a measurement unit, minimizing to the noise level the impact of the offset voltages in the whole measuring system. The sources that cause noise components in the digital output are defined and the guidelines for their minimization are specified.