Sensor circuit for detection of an abnormal offset voltage
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United States of America Patent
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Dec 16, 2008
Grant Date -
Feb 22, 2007
app pub date -
Aug 8, 2006
filing date -
Aug 22, 2005
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Abstract
A sensor circuit includes an AC component pickup circuit and first and second adder circuits or first and second high-pass filters, and specifies a range of normal voltages by an upper-limit voltage formed by adding an upper-limit threshold value to the AC component in the input voltage and by a lower-limit voltage formed by adding a lower-limit threshold value to the AC component in the input voltage. An abnormal offset voltage is detected by judging whether the output voltage of an inverting amplifier circuit is lying in the range of normal voltages.
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