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Current sensor

  • US 20060170529A1
  • Filed: 01/27/2006
  • Published: 08/03/2006
  • Est. Priority Date: 01/31/2005
  • Status: Active Grant
First Claim
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1. A current sensor for detecting a current in the range of 10 mA to 50 mA, comprising:

  • a first conductor disposed in a first layer, the first conductor having a first extended portion extending in a first direction and being supplied with the current; and

    a first magnetoresistive element disposed in a second layer in an area corresponding to the first extended portion, a resistance value of the first magnetoresistive element varying according to a first magnetic field generated by the current flowing through the first extended portion, the current sensor satisfying the following conditional expressions (1) and (2);


    0.4 μ

    m≦

    D1≦

    1.0 μ

    m  



    (1)
    0.4 μ

    m2

    S1≦

    3.0 μ

    m2



    (2) where D1 is a distance between a first extended portion and a first magnetoresistive element; and

    S1 is an area of a cross-section orthogonal to a first direction in the first extended portion.

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