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Abstract

An apparatus for sampling a power supply current value for performing frequency analysis of the power supply current flowing in an integrated circuit with a test signal applied to the integrated circuit has a power supply generating a prescribed supply of power for the integrated circuit (DUT: device under test), a current detection means for observing the power supply current value supplied from the power supply to the DUT, a test signal generation means for generating a prescribed test signal to be applied to an input/output terminal other than a power supply terminal of the DUT and for generating a test signal application signal during application of the test signal to the DUT, a sampling means for sampling the power supply current value signal, a sampling time determining means for instructing the sampling means with regard to the start and end timing for sampling, based on the test signal application signal, a sampling data storage means for storing data sampled by the sampling means, a Fourier transform means for performing a Fourier transformation calculation on the sampled data, and a main control means for outputting instructions to various other means and performing overall apparatus control.

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