| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving circuit and method of capacitive load which enable the inhibition of a generation of heat and realizing a stable movement, a liquid droplet discharging device, a liquid droplet discharging unit and an ink-jet head driving circuit. SOLUTION: According to a comparator 32, which performs a pulse-duration modulation and outputs a digital signal, and an analog drive signal into which the electric power of the digital signal output by the comparator 32 has been input by a digital power amplifier 34 and a first filter 36 by which the output from the digital power amplifier 34 is smoothed, the power of the digital signal processed with the pulse-duration modulation is amplified. The output of the first filter 36 is fed back to an operational amplifier 30 by a smoothing circuit 42. A second filter 38 with a time constant smaller than the one of the first filter 36 is provided. The output of the digital power amplifier 34 is fed back to the operational amplifier 30 by a smoothing circuit 40 through the second filter 38. The digital power amplifier 34 is composed so as to ensure a high-speed switching movement while inhibiting the generation of heat. COPYRIGHT: (C)2006,JPO&NCIPI
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