| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving driver, a driving amplifier and an information apparatus that generate driving signals of differential signals with a minimum number of switching elements and drive a capacitive load according to the driving signals. <P>SOLUTION: A piezoelectric speaker driving amplifier 14 consumes less energy transferred from a capacitor 41 to a piezoelectric speaker 15 through a resistance and the like and reuses it as energy for driving the piezoelectric speaker 15. Specifically, a gate driver circuit 23 switches conduction states of PMOS transistors 45-49 of a switching drive circuit 24 according to each operational phase of the first phase to the fourth phase. The piezoelectric speaker driving amplifier 14 can thus generate driving signals of differential signals with a minimum number of switching elements and drive the piezoelectric speaker 15 according to the driving signals. <P>COPYRIGHT: (C)2013,JPO&INPIT |
