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High-precision voltage-to-current converters based on single-chip gain-selectable amplifiers

Authors
  • Salvatori, Stefano1
  • Rossi, Maria Cristina2
  • Girolami, Marco3
  • 1 Università Niccolò Cusano, Faculty of Engineering, Via Don Carlo Gnocchi, 3, Rome, 00166, Italy , Rome (Italy)
  • 2 Università Roma Tre, Department of Engineering, Via Vito Volterra, 62, Rome, 00146, Italy , Rome (Italy)
  • 3 CNR-ISM, Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, Via Salaria km 29,300, Monterotondo Stazione, Rome, 00015, Italy , Monterotondo Stazione, Rome (Italy)
Type
Published Article
Journal
Analog Integrated Circuits and Signal Processing
Publisher
Springer US
Publication Date
Jan 23, 2019
Volume
99
Issue
3
Pages
491–495
Identifiers
DOI: 10.1007/s10470-019-01400-6
Source
Springer Nature
Keywords
License
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Abstract

A new application of single-chip gain-selectable amplifiers for Howland current pump circuits is here presented and discussed. LT199x integrated circuits, by Linear Technology, were used for the implementation of extremely accurate voltage-to-current conversion. Circuit performance was evaluated for resistive temperature-sensors biasing and signal conditioning. Experimental results highlight the excellent performance of the fabricated prototypes in terms of linearity and sensitivity. In addition, a ratiometric measurement method can be applied, ensuring virtual nulling of errors caused by the limited absolute accuracy of the voltage supply and/or the voltage reference used for the whole acquisition system.

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