公开(公告)号：US20180220927A1

公开(公告)日：2018-08-09

申请号：US15888569

申请日：2018-02-05

Applicant: Boston Scientific Scimed Inc.

Inventor： David W. Kelly ,  Mathew Hein

IPC: A61B5/06 ,  G01D5/16

CPC classification number: A61B5/062 ,  A61B2562/0223 ,  G01D5/145 ,  G01D5/16 ,  G01R33/09 ,  G01R33/093

Abstract: A sensing apparatus includes a magneto-resistive sensing element and a coil element formed on a first chip, and semiconductor circuitry formed on a second chip. The magneto-resistive sensing element senses magnetic fields, while the coil element is used to reset a magnetic orientation of the magneto-resistive sensing element. The semiconductor circuitry includes a reset circuit that controls the coil element and an amplifier circuit coupled to the magneto-resistive sensing element. The amplifier circuit operates to generate a sensing signal that is proportional to the sensed magnetic fields. The sensing signal is then used to activate the reset circuit.