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Capacitance Deviation-to-Time Interval Converter Using Current-Tunable Schmitt Triggers
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- Authors
- Hoon Kim, Ji-Mann Park, Won-Sup Chung, Hee-Jun Kim
- Issue Date
- 2011-02
- Citation
- IEICE Electronics Express, v.8, no.3, pp.155-160
- ISSN
- 1349-2543
- Publisher
- IEICE
- Language
- English
- Type
- Journal Article
- Abstract
- A capacitance deviation-to-time interval converter is presented for interfacing capacitive sensors. It consists of two ramp integrators, two current-tunable Schmitt triggers, and two logic gates. A prototype circuit built using discrete components exhibits a resolution as high as 13 bits and a linearity error less than 짹0.2% when the output pulse width is counted by a 20MHz clock signal. Its application to a humidity sensor is also presented. © IEICE 2011.
- KSP Keywords
- Capacitive sensor, Time interval, clock signal, current-tunable, humidity sensor, linearity error, logic gate, pulse width