Magnetic sensor with a signal processing circuit
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United States of America Patent
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Sep 10, 2002
Grant Date -
Feb 21, 2002
app pub date -
Aug 27, 1999
filing date -
Feb 28, 1997
priority date (Note) -
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Abstract
A magnetic sensor with a signal processing circuit includes a magnetic sensor section 4 composed of a compound semiconductor thin film or a magnetic thin film, and a signal processing circuit 5 for amplifying a magnetic signal the magnetic sensor section detects as an electrical output. The signal processing circuit 5 includes an operational amplifier 51 and a constant current circuit 52 for carrying out feedback. The constant current circuit 52 in the signal processing circuit 5 includes a plurality of resistors with two or more different temperature coefficients, and the current output from the constant current circuit has a temperature coefficient inversely proportional to the temperature coefficient of the combined resistance of the plurality of the resistors.
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