| 摘要 |
PROBLEM TO BE SOLVED: To propose a test method that can test a correlated double sampler for which a high-speed operation is required, by using an inexpensive device, and to propose a test device employing this test method. SOLUTION: In the correlated double sampler that is provided with a differential amplifier 17 and sample-hold circuits 15, 16 that conduct sampling with sampling clocks whose phases differ from each other and given to a noninverting input terminal and an inverting input terminal of this differential amplifier and uses the differential amplifier to extract a difference between sample-hold signals SB, SC sampled and held by the sample-hold circuits and to provided an output, whether or not the correlated double sampler is normally in operation is decided depending on whether or not a signal with a periodicity is outputted to an output terminal 18 in such a state that the sample-hold circuits 15, 16 receive a continuous wave with a frequency of about 1/100 of the frequency of the sampling clock and apply sampling and holding to the continuous wave. |
