Detection circuit, semiconductor integrated circuit device, magnetic field rotation angle detection device, and electronic device

A detection circuit that is connectable to a magnetic sensor in which a first sensor unit and a second sensor unit are arranged at a predetermined angle with respect to each other, each sensor unit having a bridge circuit of magnetoresistance elements, the detection circuit comprising:

• a first comparison circuit including a first comparator that compares two output signals of the first sensor unit and outputs a first detection signal that indicates a first comparison result;
• a second comparison circuit including:
• an amplification unit that amplifies an output signal of the first sensor unit by a predetermined amplification factor and outputs a first amplified signal and a second amplified signal, the amplified signals having the same amplitude and mutually different signs;
• a second comparator that compares an output signal of the second sensor unit with the first amplified signal and outputs a second detection signal that indicates a second comparison result;
• and
• a third comparator that compares the output signal of the second sensor unit with the second amplified signal and outputs a third detection signal that indicates a third comparison result;
• and
• a rotation angle calculation circuit that calculates a rotation angle of a magnetic field based on the comparison result of the first comparison circuit and one of the comparison results of the second comparison circuit.

A detection circuit that is connectable to a magnetic sensor in which a first sensor unit and a second sensor unit are arranged at a predetermined angle with respect to each other, each sensor unit having a bridge circuit of magnetoresistance elements, the detection circuit comprising:

• a first comparison circuit including a first comparator that compares two output signals of the first sensor unit and outputs a first detection signal that indicates a first comparison result;
• a second comparison circuit including:
• an amplification unit that amplifies one of the two output signals of the first sensor unit by a predetermined amplification factor and outputs an amplified signal;
• a second comparator that compares a first output signal of the second sensor unit with the amplified signal and outputs a second detection signal that indicates a second comparison result;
• and
• a third comparator that compares a second output signal of the second sensor unit with the amplified signal and outputs a third detection signal that indicates a third comparison result;
• and
• a rotation angle calculation circuit that calculates a rotation angle of a magnetic field based on the comparison result of the first comparison circuit and one of the comparison results of the second comparison circuit.