Patent ID: 7244007

Claim:
A capacitive load driving circuit which applies a driving signal to a capacitive load for driving the capacitive load, the capacitive load driving circuit comprising: an operational amplifier, which outputs a differential signal between a signal which is fed back to an inverting input terminal and an input signal which is inputted to a non-inverting input terminal; a pulse width modulator, which pulse width-modulates output of the operational amplifier and outputs a digital signal; a digital power amplifier, which amplifies power of the digital signal; a first filter, which smooths output of the digital power amplifier and inputs the smoothed signal to the capacitive load as the driving signal; a first feedback circuit, which feeds back the driving signal outputted from the first filter to the inverting input terminal of the operational amplifier; and a second feedback circuit, which feeds back a signal outputted from the digital power amplifier, which signal includes a phase which is advanced relative to the driving signal, to the inverting input terminal of the operational amplifier.