GMR high current, wide dynamic range sensor
First Claim
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1. A Giant MagnetoResistive (GMR) current sensor for sensing a current in a strip line, said GMR current sensor comprising:
- a silicon chip a GMR current sensor element placed on said silicon chip for sensing the current in the strip line; and
an integrated drive coil placed on said GMR current sensor element with on-chip turns and having a feedback support circuit to cancel spurious fields from the strip line.
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Abstract
A configuration where a wide range of current can be sensed accurately in spite of using a magnetic material with non-linearities and limited hysteresis. This configuration includes: a strip line current carrier, an IC chip containing a GMR sensor element, an integrated drive coil, like an isoloop. Field produced by current in the strip line is detected by the sensor. Feedback field is produced by current in an on-chip coil to counteract spurious fields from the strip line.
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Citations
2 Claims
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1. A Giant MagnetoResistive (GMR) current sensor for sensing a current in a strip line, said GMR current sensor comprising:
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a silicon chip a GMR current sensor element placed on said silicon chip for sensing the current in the strip line; and
an integrated drive coil placed on said GMR current sensor element with on-chip turns and having a feedback support circuit to cancel spurious fields from the strip line. - View Dependent Claims (2)
a first magnetic shield layer placed on top of the integrated drive coil; and
a second magnetic shield layer between the silicon chip and the strip line.
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Specification
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Current AssigneeAir Force Government of The United States of America As Represented By The Secretary
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Original AssigneeUnited States Of America As Represented By The Secretary Of The Air Force
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InventorsStokes, John, Daughton, James
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Primary Examiner(s)Le, N.
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Assistant Examiner(s)Nguyen, Vincent Q.
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Application NumberUS09/643,902Time in Patent Office715 DaysField of Search324/252, 324/324, 324/207.21, 324/360, 324/117.R, 324/207.12, 324/207.19, 324/207.22, 324/529, 338/32.RUS Class Current324/117.00RCPC Class CodesB82Y 25/00 Nanomagnetism, e.g. magneto...G01R 15/205 using magneto-resistance de...G01R 33/093 using multilayer structures...
