Patent ID: 9102141
Filing Date: 2015-08-11
Classification: A61B,B41J

Abstract:
1. A capacitive load driving circuit comprising: a drive waveform signal generator that generates a drive waveform signal; a subtractor that outputs a differential signal between the drive waveform signal and a feedback signal; a modulator that pulse-modulates the differential signal and outputs a modulated signal; a digital power amplifier that amplifies the power of the modulated signal and outputs a power-amplified modulated signal; a smoothing filter that is constructed by connecting an inductor and a capacitive load with a wire, smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load; and a feedback circuit which outputs the feedback signal, wherein the feedback circuit comprises: wherein the first resistance element and the capacitance element of the first portion are located between a first connecting point where the inductor is connected to the wire and a second connecting point where the first terminal is connected to the terminal of the first portion, wherein a signal output from the first connecting point is made to pass through the feedback circuit and is then used as the feedback signal to the subtractor.