Patent ID: 8963539
Filing Date: 2015-02-24
Classification: G01R

Abstract:
1. An electronic circuit for detecting magnetism of a detection target object, comprising: a detection unit in which at least three detection blocks, each including four magnetic field detection elements arranged in two rows and two columns, are arranged in a straight line; a control unit configured to select first and second detection blocks from among the at least three detection blocks based on the detection target object; a switching unit configured to connect the selected first and second detection blocks to an output of the electronic circuit based on a control operation of the control unit; and first and second processing units respectively connected to the first and second detection blocks through the switching unit disposed therebetween, each of the first and second processing units configured to decrease an offset component included in a signal from the magnetic field detection element, which is included in each of the first and second detection blocks, wherein each of the detection elements corresponds to a hall element, and a source voltage is applied to each of the four magnetic field detection elements such that a phase difference between a current flowing in one magnetic field detection element and a current flowing in the other magnetic field detection element becomes 90 degrees, 180 degrees, or 270 degrees.