A 17.4-b Delta-Sigma Capacitance-to-Digital Converter for One-Terminal Capacitive Sensors
| Autor: | Jeongjin Roh, Quanzhen Duan, Youngjae Jung |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Digital electronics
Engineering Bandgap voltage reference Analogue electronics business.industry Capacitive sensing 020208 electrical & electronic engineering 010401 analytical chemistry Electrical engineering Mixed-signal integrated circuit 02 engineering and technology Delta-sigma modulation Chip 01 natural sciences 0104 chemical sciences Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering business Analog device |
| Zdroj: | IEEE Transactions on Circuits and Systems II: Express Briefs. 64:1122-1126 |
| ISSN: | 1558-3791 1549-7747 |
| Popis: | In this brief, we present a capacitance-to-digital converter (CDC) for one-terminal capacitive sensors. The designed CDC implements a digital correction technique to reduce nonidealities and noises, such as the offset, 1/f noise, and power supply noise. This correction technique can also minimize effectively the complexity of the analog front-end circuit. All sensor functions, including analog circuits (delta-sigma CDC, bandgap reference, and voltage regulator) and digital logics (microprocessor, memories, and interface logics), are integrated into a single chip and occupy approximately 90% of the area. The chip is fabricated in a 0.18- $\mu\mbox{m}$ standard CMOS process, which does not have a deep n-well stage. The analog and digital circuits, including the digital input/output pads, must share the same substrate in this design. However, the measurement results demonstrate highly effective resolutions of 16 to 17.4 b, which are achieved with different conversion times. |
| Databáze: | OpenAIRE |
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