Capacitance sensor with asynchronous ring oscillator circuit
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United States of America Patent
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app pub date -
Oct 10, 2007
filing date -
Feb 12, 2002
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Abandoned
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Abstract
A capacitance sensor comprises an asynchronous ring first in first out (FIFO) oscillator circuit having an electrode for receiving a sample for analysis. A sample placed into contact with the electrode causes a change in capacitance at the electrode which gives rise to a change in the oscillation frequency of the ring. This change in oscillation frequency can be used to identify the sample.
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