Patent ID: 9711706
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A piezoelectric element drive circuit configured to apply to a piezoelectric element two drive signals with opposite phases, the piezoelectric element drive circuit comprising: an H bridge circuit including a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first output terminal and the second output terminal being connected to the piezoelectric element; a current detection resistance connected between the piezoelectric element and the first output terminal; a differential amplifier circuit configured to receive, as an input, a voltage between opposite ends of the current detection resistance; and an inverter circuit connected to an output terminal of the differential amplifier circuit; wherein an input terminal of the inverter circuit is connected to the first input terminal, and an output terminal of the inverter circuit is connected to the second input terminal; and the differential amplifier circuit includes a slew rate reducing circuit.