This paper describes an energy-efficient resistor-to-digital converter (RDC) for detecting benzene, toluene, ethylbenzene and xylene (BTEX). The sensor's selectivity is adjusted by the different heat levels, thereby detecting the BTEX with a single-R sensor. The sensor is directly digitized by an energy-efficient RDC based on a continuous-time delta-sigma ADC. The proposed RDC achieves a better energy-efficiency by processing the signal in current domain. The prototype chip implemented in a 0.11-μm CMOS consumes only 95μW from a 1.5-V supply. It achieves a resistance resolution of 863mΩ with a 0.5-ms measurement time. This corresponds to a gas resolution of 0.06ppb and an energy per measurement of 47.5nJ. This work is fully verified through the BTEX measurements.
|Title of host publication
|2021 Symposium on VLSI Circuits, VLSI Circuits 2021
|Institute of Electrical and Electronics Engineers Inc.
|Published - 2021 Jun 13
|35th Symposium on VLSI Circuits, VLSI Circuits 2021 - Virutal, Online
Duration: 2021 Jun 13 → 2021 Jun 19
|IEEE Symposium on VLSI Circuits, Digest of Technical Papers
|35th Symposium on VLSI Circuits, VLSI Circuits 2021
|21/6/13 → 21/6/19
Bibliographical notePublisher Copyright:
© 2021 JSAP.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering