Patent ID: 7049812
Filing Date: 2006-05-23
Classification: G01R

Abstract:
1. A magnetic field sensor characterized by comprising: a magnetic field element which outputs a signal in accordance with an applied magnetic field strength in first and second phases of a signal given from the outside of said magnetic field element, wherein polarities of the signal from said magnetic field element in said first phase and said second phase are mutually opposite; an amplifier which amplifies the signal from this magnetic field element and outputs a voltage signal across a pair of output terminals; a condenser of which both ends are connected to the pair of output terminals of said amplifier; a switch which is inserted and makes a connection between one of said output terminals in the pair and one terminal of said condenser, and which is closed in said first phase of the signal and is opened in said second phase of the signal; and a comparator which inputs voltage across both ends of said switch and converts a result of the comparison of the voltage across both ends of said switch with a predetermined voltage into a binary signal so as to output.