Design Methodology for an Adjustable-Range CMOS Smart Temperature Sensor

YILDIZ U., OZANOĞLU K., DÜNDAR G.

18th International Conference on Synthesis, Modeling, Analysis and Simulation Methods, and Applications to Circuit Design, SMACD 2022, Villasimius, İtalya, 12 - 15 Haziran 2022, (Tam Metin Bildiri) identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/smacd55068.2022.9816176
  • Basıldığı Şehir: Villasimius
  • Basıldığı Ülke: İtalya
  • Anahtar Kelimeler: ADC, CMOS temperature sensor, full-scale range, MIM capacitor, sigma-delta modulator
  • Boğaziçi Üniversitesi Adresli: Evet

Özet

In this work, a design methodology for adjusting the full-scale range of CMOS temperature sensors utilizing ΣΔ modulators for biomedical applications is proposed, aiming to relax design requirements. A sample sensor system is presented as a case study to obtain 30°C dynamic range by utilizing different unit MIM capacitor branches with a first-order ΣΔ modulator topology. Simulation results of the designed temperature sensor show 0.03°C resolution by using 0.18mm2 silicon area in a 0.18μm CMOS technology. By utilizing the proposed design methodology based on mathematical extrapolation, it is demonstrated that the obligation of the minimum second-order ΣΔ ADC based temperature sensor design is eliminated by more efficient use of the full-scale range, achieving a cost-effective design in terms of power and design complexity.