Title :
Magnetically coupled linear isolator
Author :
Hermann, T.M. ; Black, W.C. ; Hui, S.
Author_Institution :
Nonvolatile Electron. Inc., Eden Prairie, MN, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
A linear isolation device has been fabricated using giant magnetoresistance (GMR) thin film structures to sense current in a planar coil across a Si3N4 insulation barrier. NiFe shields are electroplated to improve signal and shield stray field noise. The devices were connected to an external current replicating circuit realized from discrete components. Measured output characteristics include nonlinearity of less than 1%, and withstanding voltages over 2.5 kV
Keywords :
coils; electric current measurement; giant magnetoresistance; magnetic multilayers; magnetic noise; magnetic sensors; magnetic shielding; magnetoresistive devices; 1.2 kV; 2.68 kV; GMR thin film structures; NiFe shields; Si3N4; Si3N4 insulation barrier; Ta-NiFeCo-CoFe-Cu-CoFe-NiFeCo-Ta; current sensing; electroplating; external current replicating circuit; magnetically coupled linear isolator; multi-channel isolation; nonlinearity; output characteristics; planar coil; stray field noise shielding; withstanding voltages; Circuit noise; Coils; Couplings; Giant magnetoresistance; Insulation; Isolators; Magnetic shielding; Semiconductor thin films; Thin film circuits; Thin film devices;
Journal_Title :
Magnetics, IEEE Transactions on
