| 摘要 |
<p>A sensor comprising a substrate on which a plurality of resistive elements (7a, 7b, 7c, 7d) is arranged in a Wheatstone bridge configuration (5), whereby at least one of the resistive elements demonstrates a magneto-resistive effect, the resistive elements (7a, 7b, 7c, 7d) being provided in branches which respectively connect: (a) a current input terminal (Ii) with a first voltage terminal (VQ); (b) the first voltage terminal (VQ) with a current output terminal (Io); (c) the current output terminal (Io) with a second voltage terminal (VR); (d) the second voltage terminal (VR) with the current input terminal (Ii), whereby the sensor comprises a second Wheatstone bridge (5') which is electrically connected to the first Wheatstone bridge (5) already referred to, the first and second Wheatstone bridges (5, 5') being identical except in that, if a given magneto-resistive element in a given branch in one bridge has a positive output polarity, then the corresponding magneto-resistive element in the same branch in the other bridge has a negative output polarity. By adding the output signals from the two Wheatstone bridges (5, 5'), the zero-point offset of the sensor can be determined and eliminated. This is achieved without the need to use the so-called flipping technique employed in conventional sensors.</p> |
