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We present a current-sensitive CMOS front-end able to measure signals down to the attoampere level. The key component is a reset network based on tunneling and/or hot-electron injection that introduces no measurable leakage and noise when not activated, enabling attoampere current measurements on a time scale of just a few seconds. The circuit successfully unlocks the full potential of capacitive-feedback transimpedance amplifiers as high-resolution current front-ends, opening new applications in the field of nanoscience.

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CMOS Preamplifier for Attoampere Current Measurements

  • 会议论文

  • 发表日期：

    2026年

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  • Cainã de Oliveira Figares,
  • Francesco Zanetto,
  • Marco Sampietro,
  • Giorgio Ferrari

摘要

We present a current-sensitive CMOS front-end able to measure signals down to the attoampere level. The key component is a reset network based on tunneling and/or hot-electron injection that introduces no measurable leakage and noise when not activated, enabling attoampere current measurements on a time scale of just a few seconds. The circuit successfully unlocks the full potential of capacitive-feedback transimpedance amplifiers as high-resolution current front-ends, opening new applications in the field of nanoscience.