Drive circuit for driving a capacitive load

摘要

A liquid discharge apparatus includes: a modulation circuit that generates a modulated signal by pulse-modulating a source signal; a transistor that amplifies the modulated signal to generate an amplified modulated signal; a low-pass filter that includes an inductor and a capacitor and smoothes the amplified modulated signal to generate a drive signal; a feedback circuit that returns the drive signal to the modulation circuit; a circuit board; a piezoelectric element that is displaced by application of the drive signal thereto. The circuit board has a first mounting surface and a second mounting surface. The capacitor and the feedback circuit are mounted and a first ground wiring connected to the capacitor and a second ground wiring connected to the feedback circuit are provided on the first mounting surface. At least one of the modulation circuit, the transistor, and the inductor is mounted on the second mounting surface.

主权项

1. A drive circuit for driving a capacitive load, comprising:
a modulation circuit that generates a modulated signal by pulse-modulating a source signal; a transistor that amplifies the modulated signal to generate an amplified modulated signal; a low-pass filter that includes an inductor and a capacitor and smoothes the amplified modulated signal to generate a drive signal which is applied to the capacitive load; a feedback circuit that returns the drive signal to the modulation circuit; and a circuit board on which the modulation circuit, the transistor, the low-pass filter, and the feedback circuit are mounted, wherein the circuit board has a first mounting surface and a second mounting surface, wherein the capacitor and the feedback circuit are mounted and a first ground wiring connected to the capacitor and a second ground wiring connected to the feedback circuit are provided on the first mounting surface, and wherein at least one of the modulation circuit, the transistor, and the inductor is mounted on the second mounting surface.