This article presents a novel approach to analog DFT. The approach is based on wideband undersampling techniques using multiple samplers on-chip. Using this technique, signals being tested can be mixed down to lower frequencies before being brought off-chip.

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Journal IEEE Design and Test of Computers
Mason, R, & Ma, S. (Shing). (1999). Analog DFT Using an Undersampling Technique. IEEE Design and Test of Computers, 16(4), 84–88. doi:10.1109/54.808225