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A 125$\mu$W 8kS/s Sub-pA Area-Efficient Current Sensing 45nm CMOS ADC for Biosensing

Signal Processing 2021-07-14 v1
Authors: Mitra Saeidi , Luke Theogarajan
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Abstract

This paper presents a 125μ\muW, area efficient (0.042mm2) 81dB DR, 8kS/s current sensing ADC in 45nm CMOS capable of sensing sub-pA currents. Our approach combines the transimpedance amplifier (TIA) and ADC into a unified structure by folding a low-noise capacitive TIA into the first stage integrator of a 2nd order Delta-Sigma modulator. The dominant DAC feedback noise is mitigated by utilizing current scaling via slope modification by an integrator and differentiator pair.

Keywords

current sensing adc sub-pa current transimpedance amplifier delta-sigma modulator biosensing low power cmos area efficient

Cite

@article{arxiv.2107.05794,
  title  = {A 125$\mu$W 8kS/s Sub-pA Area-Efficient Current Sensing 45nm CMOS ADC for Biosensing},
  author = {Mitra Saeidi and Luke Theogarajan},
  journal= {arXiv preprint arXiv:2107.05794},
  year   = {2021}
}

Comments

2 pages, 5 figures

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