8-bit Dynamic Element Matching based Feedback Controller Applied to an Instrumentation Amplifier

Alex Calinescu, Marius Enachescu*, Alexandru Antonescu, Sorin Cotofana

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The instrumentation amplifier, which incorporates Dynamic Element Matching (DEM) and a resistive network, utilizes a digital controller to reduce gain error by means of averaging. This paper assesses the feasibility of combining, within a general-purpose microcontroller, the appealing DEM, i.e., very accurate resistive ratios ranging between 1 and 15, with the associated versatile and scalable interrupt-aware digital controller. Given a mixedsignal system, a hybrid evaluation environment has been developed to perform relevant testbenches for assessing the systems performance, i.e., DEM controller, muxes, OpAmps, with respect to relevant metrics for integrated digital and mixed-signal circuits, i.e., energy, delay, footprint, precision. When implementing our design in a commercial 180nm technology, the gain precision of a typical amplifier is improved by more than 1800 times, with the error converging to as low as 10s of ppm, for Gaussian mismatch distribution between-1% and 1% with the cost of DEM digital circuitry which adds about 30000 µm2 of chip area and will consume 194 µA.

Original languageEnglish
Pages (from-to)217-228
Number of pages12
JournalRomanian Journal of Information Science and Technology
Volume27
Issue number2
DOIs
Publication statusPublished - 2024

Keywords

  • digital controller
  • Dynamic Element Matching
  • gain error
  • instrumentation amplifier
  • mismatch

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