Reading circuit for a magnetic field sensor with sensitivity calibration, and related reading method
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United States of America Patent
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Apr 21, 2015
Grant Date -
Jun 21, 2012
app pub date -
Nov 22, 2011
filing date -
Nov 26, 2010
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Abstract
A reading circuit for a magnetic-field sensor, generating an electrical detection quantity as a function of a detected magnetic field and of a detection sensitivity, is provided with an amplification stage, which is coupled to the magnetic-field sensor and generates an output signal as a function of the electrical detection quantity and of an amplification gain. In particular, the amplification gain is electronically selectable, and the reading circuit is moreover provided with a calibration stage, integrated with the amplification stage and configured so as to vary a value of the amplification gain in such a way as to compensate a variation of the detection sensitivity with respect to a nominal sensitivity value.
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