Patent ID: 7482829
Filing Date: 2009-01-27
Classification: G01R

Abstract:
1. An electric power applying circuit for applying a direct current power to a load, comprising: 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, the main amplifier exhibiting 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.