Patent ID: 8547265
Filing Date: 2013-10-01
Classification: G01R

Abstract:
1. A power supply apparatus for a test apparatus configured to supply a power supply signal to a device under test, the power supply apparatus comprising: an A/D converter configured to perform analog/digital conversion of an analog observed value that corresponds to the power supply signal so as to generate a digital observed value; a digital signal processing circuit configured to generate, by digital processing, a control value adjusted such that the digital observed value received from the A/D converter matches a predetermined reference value; and a D/A converter configured to perform digital/analog conversion of the control value, and to supply the control value thus subjected to digital/analog conversion as the power supply signal, wherein the digital signal processing circuit is configured to be capable of switching the content of signal processing, and wherein the digital signal processing circuit is configured to switch the content of the signal processing according to a range in which the observed value is included, and wherein the digital signal processing circuit is configured to have a first mode, a second mode, and a third mode, which are switchable, and in each of which the content of the signal processing is different, when the generation of the power supply signal is initiated, and wherein, when the power supply signal is lower than a first threshold value, the digital signal processing circuit operates in the first mode, and wherein, when the power supply signal is higher than the first threshold value and is lower than a second threshold value that is set to be higher than the first threshold value, the digital signal processing circuit operates in the second mode, and wherein, when the power supply signal is higher than the second threshold value, the digital signal processing circuit operates in the third mode.