Patent ID: 8466644

Claim:
A motor driving circuit configured to receive a Hall signal, which comprises a first signal and a second signal that are complementary, from a Hall sensor, and to drive a motor, the motor driving circuit comprising: a first A/D converter and a second A/D converter respectively configured to perform analog/digital conversion of the first signal and the second signal of the Hall signal so as to generate a third signal and a fourth signal in the form of digital signals; a differential conversion circuit configured to generate a fifth signal in the form of a single-ended signal that corresponds to the difference between the third signal and the fourth signal; an offset correction circuit configured to correct offset of the fifth signal so as to generate a sixth signal; an amplitude control circuit configured to stabilize the amplitude of the sixth signal to be a predetermined target value, and to generate the absolute value of the resulting value, so as to generate a seventh signal; a control signal generating unit configured to generate a control signal based upon the seventh signal; and a driver circuit configured to drive the motor according to the control signal.