Method for Measuring Small Nonlinearities of Electric Characteristics

Tom Guldbrandsen, Niels I Meyer, Jørgen Schjær-Jacobsen

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Abstract

A method is described for measuring very small deviations from linearity in electric characteristics. The measurement is based on the harmonics generated by the nonlinear element when subjected to a sine wave signal. A special bridge circuit is used to balance out the undesired harmonics of the signal generator together with the first harmonic frequency. The set-up measures the small-signal value and the first and second derivative with respect to voltage. The detailed circuits are given for measuring nonlinearities in Ohmic and capacitive components. In the Ohmic case, a sensitivity in the measurement of the relative second order nonlinearity of about 5×10−8 is obtained. In the capacitive case, the sensitivity expressed in terms of the minimum measurable values of the derivatives is dC/dV = 1.5×10−17 F/V and d2C/dV2 = 2×10−16 F/V2. ©1965 The American Institute of Physics
Original languageEnglish
JournalReview of Scientific Instruments
Volume36
Issue number6
Pages (from-to)743-746
ISSN0034-6748
DOIs
Publication statusPublished - 1965

Bibliographical note

Copyright (1965) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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