Capacitance type sensor device
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
May 31, 1995
filing date -
May 31, 1994
priority date (Note) -
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Abstract
A capacitance detector comprises switches for charging and discharging a sensing part, an integrator constituted by a condenser and an operational amplifier for integrating a charging current or a discharging current which is generated according to the charging and discharging the sensing part, a switch for charging an output voltage of the operational amplifier and for feedbacking an electric charge to the integrator, and a condenser. The capacitance detector can be provided by the operational amplifier having a low response performance and a small output current and no hold sample circuit, thereby a circuit scale of the capacitance type sensor can be made small.
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