Magnetic sensor device
View Patent ↗Provided is a magnetic sensor device capable of performing signal processing at high speed with high accuracy. The magnetic sensor device includes: a plurality of Hall elements; a plurality of differential amplifiers to which the plurality of Hall elements are connected, respectively; a detection voltage setting circuit for outputting a reference voltage; and a comparator including: a plurality of differential input pairs connected to the plurality of differential amplifiers, respectively; and a differential input pair connected to the detection voltage setting circuit.
1. A magnetic sensor device for outputting a signal in accordance with an intensity of a magnetic field applied to a Hall element, the magnetic sensor device comprising:
a plurality of Hall elements;
a plurality of differential amplifiers to which the plurality of Hall elements are connected, respectively;
a reference voltage generation circuit configured to output at least one reference voltage; and
a comparator comprising:
a plurality of differential input pairs connected to the plurality of differential amplifiers for outputting amplified signal voltages, respectively; and
a differential input pair connected to the reference voltage generation circuit configured to output a second reference voltage, and wherein the comparator is configured to output a result of comparison of the amplified voltages.
2. A magnetic sensor device according to claim 1 ,
wherein the plurality of differential amplifiers comprise:
a first differential amplifier comprising:
a first input terminal and a second input terminal respectively connected to an output terminal pair of a first Hall element; and
a first output terminal and a second output terminal for outputting amplified signal voltages; and
a second differential amplifier comprising:
a first input terminal and a second input terminal respectively connected to an output terminal pair of a second Hall element; and
a first output terminal and a second output terminal for outputting amplified signal voltages,
wherein the reference voltage generation circuit is configured to output a second reference voltage,
wherein the comparator comprises:
a first differential input pair including a first input terminal and a second input terminal respectively connected to the first output terminal and the second output terminal of the first differential amplifier;
a second differential input pair including a first input terminal and a second input terminal respectively connected to the first output terminal and the second output terminal of the second differential amplifier; and
a third differential input pair including a first input terminal and a second input terminal respectively connected to the first reference voltage and the second reference voltage.
3. A magnetic sensor device according to claim 1 , further comprising a differential amplifier provided between the reference voltage generation circuit and the differential input pair of the comparator.