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Frequency response of real-time digital oscilloscope with timeinterleaving architecture

This paper describes in detail how to characterize the response of a commercial real-time digital oscilloscope (RTDO) with traceability. The commercial RTDO usually employs a time interleaving ADC (TIADC) structure. Thus, aliasing is produced when the measurement is separated according to each ADC. As a result, it is difficult to obtain an accurate frequency response for each ADC. In this paper, we propose a method to avoid under-sampling issue, and it can achieve high sampling rate because it is similar to the equivalent sampling method.