Liquid ejection device and liquid ejection surgical instrument

A liquid ejection device comprising:

• a drive waveform generator generating a drive waveform signal;
• a modulator performing pulse modulation on a signal from the drive waveform generator to provide a modulated signal;
• a digital power amplifier performing power amplification on the modulated signal to provide an amplified digital signal;
• a lowpass filter smoothing the amplified digital signal to provide a drive signal of an actuator;
• a compensator advancing a phase of the drive signal to provide a negative feedback signal;
• a subtractor providing a differential signal between the drive waveform signal and the negative feedback signal as an input signal to be inputted to the modulator;
• and
• an inverse filter provided between the drive waveform generator and the subtractor,
• wherein the inverse filter changing an attenuation start frequency when a number of the actuators which are driven is changed.