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Elimination of nonlinearity with discontinuities (of dead zone) from static characteristic of converter

Domańska A.

Metrology and Measurement Systems

2008

Vol. 15, nr 4

491-500

The characteristics of real converters, including sensors, are - to a smaller or larger extent - nonlinear. Nonlinearity may result from the technologies applied to produce the converter or from the type of processing to be realized by the converter. With respect to the mathematical model describing the characteristics, they can be characteristics with smooth nonlinearity or nonlinearity with discontinuities. The author presented the problem of elimination of nonlinearity with discontinuities from the converter characteristic, which appears in the small-value area, i.e. in the dead zone, with a method utilizing the technique of added noise (dither). The properties of a converter with modified characteristic are shown: the ability to process input signals that previously could not be processed because their values were within the dead zone; removal of discontinuities in the output signal within the range of small values.