Patent ID: 7798591

Claim:
A capacitive load driving circuit, comprising: a filter comprising an inductor, one end of which is connected to an input terminal and another end of which is connected to an output terminal, and a capacitor having a fixed electrostatic capacity, and one electrode of which is connected to the output terminal, and another electrode of which is grounded; a plurality of capacitive loads, each of which is connected in parallel to the capacitor and any one of the capacitive loads is driven; a phase lead compensator that advances a phase of an output signal of the filter; a series compensator that determines an error between a driving signal and an output signal of the phase lead compensator and outputs a signal on which a proportional integral operation has been performed; a stabilization compensator that is configured independently of the phase lead compensator and outputs a signal obtained by performing a derivative action on the output signal of the filter; a voltage comparison unit that compares a summed voltage between a signal output from the series compensator and a signal output from the stabilization compensator, with a voltage of predetermined triangular waves and outputs a pulse width modulation signal; and a voltage amplification unit that amplifies the voltage of the pulse width modulation signal output from the voltage comparison unit and supplies the amplified pulse width modulation signal to the input terminal of the filter.