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Content Provider | IEEE Xplore Digital Library |
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Author | Tanaka, K. Kuramochi, Y. Kurashina, T. Okada, K. Matsuzawa, A. |
Copyright Year | 2007 |
Description | Author affiliation: Tokyo Inst. of Technol., Tokyo (Tanaka, K.; Kuramochi, Y.; Kurashina, T.; Okada, K.; Matsuzawa, A.) |
Abstract | This paper proposes a direct capacitance-to-digital converter (CDC) for biotelemetry applications. The proposed circuit is based on a charge redistribution technique using a capacitive sensor and a ranging capacitor array. The circuit does not require accurate reference voltages, so it is robust for fluctuation of supply voltage. Output-code range can be dynamically zoomed in arbitrary capacitance range of sensor output by using the ranging capacitor array. An 8-bit converter with an active area of 0.026 $mm^{2},$ consuming 0.9 nJ per sample, is demonstrated. The proposed circuit maintains its performance even in the condition of 28% fluctuations in supply voltage. Measurement results of the readout circuit are also demonstrated, which shows that the proposed circuit can work well in the presence of large parasitic capacitances. |
Starting Page | 244 |
Ending Page | 247 |
File Size | 1186090 |
Page Count | 4 |
File Format | |
ISBN | 9781424413591 |
DOI | 10.1109/ASSCC.2007.4425776 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2007-11-12 |
Publisher Place | South Korea |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Circuits Sensor arrays Capacitive sensors Capacitors Voltage fluctuations Biomedical telemetry Robustness Biosensors Capacitance measurement Voltage measurement |
Content Type | Text |
Resource Type | Article |
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