Back to Search
Start Over
A Capacitance to Digital Converter Using Continuous Time ΔΣ Modulator for Microphone-Based Auscultation.
- Source :
- IEEE Sensors Journal; 6/15/2021, Vol. 21 Issue 12, p13373-13383, 11p
- Publication Year :
- 2021
-
Abstract
- This paper presents a novel Capacitance to Digital Converter (CDC) for ultra-low power microphone-based auscultation. The proposed CDC utilizes a continuous-time Capacitance to Voltage Converter (CVC) inside a delta-sigma (ΔΣ) modulator to perform the Delta operation. The multi-bit feedback in the embedded CVC with a capacitive DAC reduces the voltage swing at its output, which permits a larger capacitive signal gain and relaxes the noise requirements. The multi-bit feedback also allows a larger signal swing at the CVC output, and improves the dynamic range. The proposed CDC was fabricated in 0.18 μm CMOS technology and was measured with a commercial capacitive sensor. Measurement results demonstrate that the proposed CDC consumes only 6.3 nJ while achieving 13-bit resolution. This corresponds to a FoM of 0.84 pJ/conversion-step. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1530437X
- Volume :
- 21
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- IEEE Sensors Journal
- Publication Type :
- Academic Journal
- Accession number :
- 151249390
- Full Text :
- https://doi.org/10.1109/JSEN.2021.3067804