Hiroyuki Yoshino,Atsushi Oshima,Kunio Tabata,Shinichi Miyazaki,Noritaka Ide
申请号：
US13075429
公开号：
US09102141B2
申请日:
2011.03.30
申请国别(地区):
US
年份:
2015
代理人:
摘要：
A capacitive load driving circuit includes: 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 smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load a compensator that causes a phase to precede the drive signal and an attenuator that attenuates signal amplitude in a band at least including a modulation frequency of the modulated signal. A signal output from a connecting point between the inductor and the wire is made to pass through the compensator and the attenuator and is then used as a feedback signal to the subtractor.
