| 摘要 |
There is provided an electric power applying circuit for applying a direct current power to a load. The electric power applying circuit includes an output buffer that (i) is supplied with, as power source voltages, positive and negative high voltages which are determined in accordance with a range of an applied voltage which is to be applied to the load, (ii) generates a voltage in accordance with an input voltage, within a range defined by the power source voltages, and (iii) applies the generated voltage to the load, a main amplifier that amplifies a voltage input thereto to generate the input voltage, and inputs the generated input voltage into the output buffer, wherein the main amplifier exhibits a higher accuracy in terms of voltage generation than the output buffer, and a floating power source that generates positive and negative floating voltages by using, as a reference, a voltage determined in accordance with a voltage output from the output buffer, and supplies the generated positive and negative floating voltages to the main amplifier as power source voltages thereof, wherein a difference in voltage between the positive and negative floating voltages is smaller than a difference in voltage between the positive and negative high voltages.
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