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BIPOLAR CHOPPING FOR 1/F NOISE AND OFFSET REDUCTION IN MAGNETIC FIELD SENSORS
BIPOLAR CHOPPING FOR 1/F NOISE AND OFFSET REDUCTION IN MAGNETIC FIELD SENSORS
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机译:磁场传感器中1 / F噪声和偏移减小的双极性斩波
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摘要
A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor comprises a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output comprising a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.
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