Name
Abstract | ||
|---|---|---|
This paper presents a readout circuit for thermal-conductivity-based resistive gas sensors. It digitizes the sensor's heat loss to its environment, which is a function of gas concentration, relative to that of a reference transducer, which is made of the same material and acts as a thermal-conductivity reference. Thus, dedicated voltage, power or temperature references are not needed. The ratiometric interface is based on a reconfigurable delta-sigma modulator that digitizes both the temperature and power ratio of the sensor and reference transducers, from which their thermal-conductivity ratio is calculated. It uses a dynamic baseline-resistance cancellation technique to relax the required dynamic range. In addition, dynamic element matching and 6-bit bias-current trimming are used to suppress errors due to transducer mismatch. The interface has been implemented in a standard 0.16 mu m CMOS technology. Experimental results obtained in combination with CMOS-compatible tungsten-wire transducers show a CO2 resolution of 228 ppm (1 sigma), which is the highest resolution reported for thermal-conductivity-based CO2 sensors. |
Year | Venue | Keywords |
|---|---|---|
2015 | Proceedings of the European Solid-State Circuits Conference | ratiometric measurement,CO2 sensor,thermal conductivity,resistive sensor,resistance-to-digital converter,delta sigma modulator |
Field | DocType | ISSN |
Resistive touchscreen,Computer science,Electronic engineering,Thermal conductivity | Conference | 1930-8833 |
Citations | PageRank | References |
0 | 0.34 | 3 |
Authors | ||
7 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Zeyu Cai | 1 | 0 | 0.68 |
| van Veldhoven, R. | 2 | 5 | 2.92 |
| Annelies Falepin | 3 | 0 | 0.34 |
| Hilco Suy | 4 | 0 | 0.34 |
| Eric Sterckx | 5 | 0 | 0.34 |
| Kofi A. A. Makinwa | 6 | 506 | 105.58 |
| Michiel A. P. Pertijs | 7 | 90 | 24.37 |