Device for measuring a force with the aid of a capacitative sensor using charge transfer
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United States of America Patent
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Oct 13, 1998
Grant Date -
N/A
app pub date -
Dec 26, 1996
filing date -
Dec 26, 1995
priority date (Note) -
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Abstract
There is described a device for delivering an output signal representative of a force by means of a capacitative sensor (1) and of an interface (5, 7, 9A, 12) for transferring charge accumulated on the capacitor (C.sub.1 and C.sub.2) of the sensor. In order to reduce the influences of the stray resistances impairing the operation of the sensor (1), the capacitors of the latter are precharged during a first operating phase, whereas during a second operating phase this charge is transferred, while the two capacitors of the sensor (1) are short-circuited and brought to the output potential of the interface.
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