Patent ID: 8757749

Claim:
A liquid ejection device in which a predetermined drive signal is applied to a capacitive load and the capacitive load is thus driven to eject a liquid, the device comprising: a drive waveform signal output circuit which outputs a drive waveform signal to serve as a reference for the drive signal; a modulator which pulse-modulates the drive waveform signal and thus generates a first modulated signal and a second modulated signal having a different phase from the first modulated signal within a range from greater than 90 degrees to smaller than 270 degrees; a first digital power amplifier which power-amplifies the first modulated signal and thus generates a first amplified digital signal; a second digital power amplifier which power-amplifies the second modulated signal and thus generates a second amplified digital signal; a first low pass filter which performs low pass filtering of the first amplified digital signal and thus generates a first demodulated signal; and a second low pass filter which performs low pass filtering of the second amplified digital signal and thus generates a second demodulated signal; wherein the first demodulated signal and the second demodulated signal are combined and applied as the drive signal to the capacitive load.