Patent ID: 8262183

Claim:
A capacitive load driving device comprising: a drive waveform generator that is adapted to generate a drive waveform signal; a subtraction section that is adapted to output a differential signal between the drive waveform signal and one of a first feedback signal and a second feedback signals; a modulator that is adapted to obtain a modulated signal by perform pulse modulation on the differential signals; a digital power amplifier that is adapted to obtain an amplified digital signal by power-amplify the modulated signal; a low pass filter that includes an inductor and a capacitor, the low pass filter being adapted to smooth the amplified digital signal to obtain a drive signal of a capacitive load; a first feedback circuit that is adapted to feed back the drive signal to the subtraction section as the first feedback signal; and a second feedback circuit that is adapted to set forward a phase of the drive signal and to feed back the drive signal with the set forward phase to the subtraction section as the second feedback signal.