Capacitance sensor using relaxation oscillators
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United States of America Patent
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-
Dec 11, 2007
Grant Date -
N/A
app pub date -
Nov 14, 2005
filing date -
Nov 14, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus that may be used to sense capacitance, as well as other functions. The apparatus includes a comparator circuit with hysteresis, a capacitor, and a current driver. The comparator circuit with hysteresis includes a first input and an output. The capacitor is coupled to the first input of the comparator circuit with hysteresis. The current driver is coupled to the output of the comparator circuit with hysteresis and to the capacitor. The current driver reciprocally sources and sinks a drive current through a terminal of the capacitor to oscillate a voltage potential at the terminal of the capacitor between a low reference potential and a high reference potential. The current driver is responsive to the output of the comparator circuit with hysteresis.
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