Patent ID: 8704478

Claim:
A motor drive circuit comprising: a filter circuit configured to attenuate a frequency band including a resonance frequency of an actuator in a target current signal, the target current signal being a digital signal indicating a target value of a driving current to be supplied to a voice coil motor configured to drive the actuator; a digital-analog converter configured to convert an output signal of the filter circuit into an analog signal, to be outputted as a current control signal; and a driving circuit configured to supply the driving current to the voice coil motor in accordance with the current control signal, the filter circuit including: a digital notch filter configured to attenuate a frequency band around the resonance frequency in the target current signal; and a digital low-pass filter configured to attenuate a frequency band greater than or equal to a predetermined frequency in the output signal of the digital notch filter, the digital low-pass filter having a sampling frequency higher than a sampling frequency of the digital notch filter.