Operation processing apparatus, angle sensor and power steering apparatus

An operation processing apparatus that calculates a rotation angle based on a first output signal that is output from a first magnetic sensor element and a second output signal that is output from a second magnetic sensor element, wherein

• the first output signal has a different signal frequency from the second output signal,
• the first output signal includes two kinds of signals that are different in phase from each other,
• the second output signal includes two kinds of signals that are different in phase from each other, and
• the operation processing apparatus comprises:
• a first cross-coupled operation part that performs a first cross-coupled operation based on one signal that is included in the first output signal and one signal that is included in the second output signal;
• a second cross-coupled operation part that performs a second cross-coupled operation based on the other signal that is included in the first output signal and the other signal that is included in the second output signal;
• a first Lissajous curve generation part that generates a first Lissajous curve based on the result of operation by the first cross-coupled operation part;
• a second Lissajous curve generation part that generates a second Lissajous curve based on the result of operation by the second cross-coupled operation part;
• and
• a rotation angle computing part that calculates the rotation angle based on the first Lissajous curve and the second Lissajous curve.