| 摘要 |
PROBLEM TO BE SOLVED: To improve power saving effects in charge and discharge circuits of capacitive loads. SOLUTION: The charge and discharge circuit of a capacitive load includes a charge and discharge section, a power storage element, a potential adjustment section, and a path selection section. The charge and discharge section charges or discharges the capacitive load so that the potential of the capacitive load changes following a potential change pattern of an analog signal. The power storage element is charged by current from a power supply section, and becomes a current source when charging the capacitive load. The potential adjustment section performs adjustment so that potential of a low-potential-side terminal that the power storage element includes becomes lower than that of the analog signal by a prescribed amount. The path selection section selects a regeneration path allowing charge from the capacitive load to flow to at least one of the power supply section and the power storage element, and a discharge path for allowing the charge from the capacitive load to the ground side according to the potential of the analog signal. COPYRIGHT: (C)2010,JPO&INPIT
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