Magnetoresistive sensor with reduced output signal jitter
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Dec 30, 1994
filing date -
Dec 30, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetoresistive sensor for use in a rotary encoder having a drum having a circumference covered with a magnetic track at a predetermined pitch includes a plurality of magnetoresistive elements positioned opposite the drum and connected in a bridge circuit such that when the drum rotates an output signal from the bridge indicates a rotary angle of the drum. The magnetoresistive elements include one or more complementary pairs of elements positioned 180.degree. out of phase. Each of such pair of complementary magnetoresistive elements is connected in one leg of a bridge circuit such that jitter effects caused by asymmetric magnetic fields and physical differences between sensor elements are cancelled.
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