Motor driver circuit for linear motor, positioning device using the same, and hard disk device

A motor driver circuit comprising:

• a current command generator configured to generate an analog command signal indicating a target amount of a drive current to be supplied to a motor as an object to be driven;
• an error detection amplifier configured to receive a current feedback signal indicating a drive current being supplied to the motor and the analog command signal, and generate an analog error signal indicating an error between the drive current being supplied to the motor and the target amount of the drive current to be supplied to the motor;
• an A/D converter configured to convert the analog error signal generated by the error detection amplifier into a digital error signal;
• a digital compensator configured to generate a digital control amount based on the digital error signal output by the A/D converter;
• a D/A converter configured to convert the digital control amount into an analog control signal;
• and
• an output stage configured to supply a drive signal according to the analog control signal to the motor.