| 摘要 |
<p>A piezoelectric element drive circuit includes an H bridge circuit, an LPF-attached differential amplifier circuit, an amplifier circuit, and an inverter circuit. First and second drive signals output from the H bridge circuit and having opposite phases are applied to a piezoelectric element. A voltage between opposite ends of a resistor connected to a first output terminal of the H bridge circuit is input to the LPF-attached differential amplifier circuit. A differential signal output from the LPF-attached differential amplifier circuit has a lower slew rate because harmonic components are suppressed by the function of a low pass filter. Accordingly, respective slew rates of first and second control signals input to first and second input terminals of the H bridge circuit are also reduced. Hence the first and second control signals are each provided as a signal having a step-like waveform and including harmonic components that have been suppressed.</p> |
