1,721,098 research outputs found
Realizzazione di un convertitore corrente-tensione per la misurazione di correnti inferiori al picoampere
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Derivation of an electronic equivalent of QHE devices
No full textModels of quantum Hall effect (QHE) devices described by an equivalent circuit are used both to analyze measurement systems and to study QHE physics. Although the most widely used equivalent is the one proposed by Ricketts and Kemeny, various other circuits have been published to suit to different needs in QHE analysis, including a network with only resistors and unity-gain amplifiers. In the following we discuss a general approach to the analysis of the electrical behavior of QHE devices, and show that they can be classified as gyrators. Gyrators are nonreciprocal network elements whose properties are well known from the theory of electrical network. They can be regarded as generalized equivalents of Hall effect devices, thus setting a general framework for the study of the electrical behavior of QHE and the derivation of equivalent circuits. Through the application of this technique, an electronic circuit capable of simulating a QHE device with nonnull longitudinal resistance is derived
Phase lock of non-hysteretic Josephson junctions with pulse bias: analytical properties
No full textThe behaviour of a non-hysteretic shunted Josephson junction can be
described by a differential equation admitting analytical solution in
the constant-current bias case. Studying the pulse bias as a sequence of
constant-bias states we were able to derive expressions for the
phase-lock condition and to study some relevant features of Shapiro
step
Preliminary studies for the realisation of an electrometer transducer for mass measurements based on fundamental constants
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Studi preliminari di un trasduttore tensione-forza per misure elettriche assolute e determinazione di costanti fisiche
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