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