Patent ID: 8376486

Claim:
A liquid jet apparatus comprising: a drive waveform generator adapted to generate a drive waveform signal; a modulator adapted to execute pulse-density modulation on the drive waveform signal; a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator, with a pair of switching elements push-pull coupled with each other; a low pass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier; and a modulation period modification circuit adapted to modify a modulation period of the pulse modulation of the modulator based the presence or absence of change in potential of the drive waveform signal, wherein in the case in which the pulse modulation by the modulator is pulse-density modulation, the modulation period modification circuit modifies the modulation period by modifying a sampling frequency of the modulator in accordance with a potential and a gradient of the drive waveform signal.