Magnetic sensor device
Provided is a magnetic sensor device including: a current input terminal; a voltage input terminal; an output terminal; a magnetic sensor circuit including a first terminal, one of one Hall element and a set of Hall elements connected in parallel to each other, and a pilot signal generating circuit; a chopper modulator/demodulator circuit including a first mixer connected to the magnetic sensor circuit, an amplifier containing an input port connected to the first mixer, a second mixer containing an input port connected to the amplifier, and an output port connected to the output terminal; and a feedback circuit including a second terminal connected to the chopper modulator/demodulator circuit, a third mixer, a voltage-current conversion circuit, and a third terminal connected to the current input terminal and the first terminal, and a fourth terminal connected to the voltage input terminal.
1. A magnetic sensor device, comprising:
a current input terminal;
a voltage input terminal;
an output terminal;
a magnetic sensor circuit including a first terminal, one of one Hall element and a set of Hall elements connected in parallel to each other, and a pilot signal generating circuit;
a chopper modulator/demodulator circuit including a first mixer connected to the magnetic sensor circuit, an amplifier containing an input port connected to the first mixer, a second mixer containing an input port connected to the amplifier, and an output port connected to the output terminal; and
a feedback circuit including a second terminal connected to the chopper modulator/demodulator circuit, a third mixer, a voltage-current conversion circuit, and a third terminal connected to the current input terminal and the first terminal, and a fourth terminal connected to the voltage input terminal.
2. The magnetic sensor device according to claim 1 , wherein the pilot signal generating circuit is a magnetic field generating circuit.
3. The magnetic sensor device according to claim 1 , wherein the pilot signal generating circuit is a current supply circuit.
4. The magnetic sensor device according to claim 1 , wherein each of the first mixer, the second mixer, and the third mixer is a passive multiplier formed of switches.
5. The magnetic sensor device according to claim 1 , wherein the voltage-current conversion circuit is a transconductance amplifier.
6. The magnetic sensor device according to claim 1 , wherein the voltage-current conversion circuit includes an AD converter, a digital signal processor, and a current output DA converter.