| 摘要 |
A piezoelectric element drive circuit for outputting a signal that drives a piezoelectric element, the piezoelectric element drive circuit including: a frequency signal generation unit that outputs a frequency signal whose frequency is altered discretely; a voltage-controlled oscillator that alters the frequency of an output signal based on an inputted voltage; a phase comparator that compares the phase of the output signal from the frequency signal generation unit and the phase of the output signal of the voltage-controlled oscillator; and a loop filter that inputs, into the voltage-controlled oscillator, an output voltage that is altered based on alterations in an output signal from the phase comparator. The output signal of the voltage-controlled oscillator is the signal that drives the piezoelectric element. |
