A 187-dB FoM<inline-formula> <tex-math notation="LaTeX">$_\textrm{S}$</tex-math> </inline-formula> Power-Efficient Second-Order Highpass <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula> Capacitance-to-Digital Converter

Yoontae Jung, Sein Oh, Sohmyung Ha, Minkyu Je

Research output: Contribution to journalArticlepeer-review

Abstract

The escalating demand for high-resolution sensor interface systems, driven by the proliferation of the Internet of Things (IoT) and wearable smart devices, has led to the widespread use of capacitive sensing transducers. These transducers are valued for their low-noise and low-power characteristics, making them suitable for various applications, including environmental and biomedical sensing. However, designing a high-resolution capacitive sensor interface system while maintaining power efficiency remains challenging. This article proposes a high-resolution energy-efficient highpass (HP) <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula> capacitance-to-digital converter (CDC) architecture. The architecture incorporates a 2<inline-formula> <tex-math notation="LaTeX">${\textrm{nd}}$</tex-math> </inline-formula>-order HP <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula> modulator (<inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula>M) and a continuous-time capacitance-to-voltage converter (CT CVC). The proposed CDC achieves an excellent capacitance resolution of 5.85 aF<inline-formula> <tex-math notation="LaTeX">$_\textrm{rms}$</tex-math> </inline-formula>, with a power efficiency of 46 fJ/conversion-step and an FoM<inline-formula> <tex-math notation="LaTeX">$_\textrm{S}$</tex-math> </inline-formula> of 187.4 dB. The HP <inline-formula> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula>M, designed with superior power efficiency, offers a promising solution for high-resolution capacitive sensor applications. Compared to state-of-the-art, the proposed CDC achieves more than 2<inline-formula> <tex-math notation="LaTeX">$\times$</tex-math> </inline-formula> FoM<inline-formula> <tex-math notation="LaTeX">$_\textrm{S}$</tex-math> </inline-formula> improvement while maintaining competitive FoM<inline-formula> <tex-math notation="LaTeX">$_\textrm{W}$</tex-math> </inline-formula>.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Volume59
Issue number4
DOIs
StatePublished - Apr 1 2024

Keywords

  • <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula> modulator (<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula>M)
  • Capacitance
  • capacitance-to-digital converter (CDC)
  • Capacitive sensors
  • Harmonic analysis
  • highpass (HP) <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula> CDC
  • highpass <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$\Delta\Sigma$</tex-math> </inline-formula>M
  • Integrated circuits
  • Internet of Things (IoT)
  • Power harmonic filters
  • sensor interface integrated circuit (IC)
  • Sensors
  • Topology

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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