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Calibration of Time-interleaved Errors in Real-time Digital Oscilloscopes



Jeffrey A. Jargon, Chihyun Cho, Joo-Gwang Lee, Paul D. Hale, Peter J. Jeavons, John B. Schlager, Andrew M. Dienstfrey


A novel method is proposed for the calibration of channel mismatch in a time-interleaved real- time digital oscilloscope (RTDO). A simple simultaneous equation is derived from the Fourier transform of the time-interleaved signals requiring only a transfer function of time- interleaved analog-to-digital converters (TIADCs), as opposed to most previous work where additional filters are employed. A measurement method is proposed for determining the transfer function of a commercial RTDO, the accuracy of which is limited by the noise produced after the interleaving process. To validate the proposed method, we measure two-tone signals using a number of commercial RTDOs. The calibrated results clearly show that signals at spurious frequencies are substantially reduced.
IEEE Transactions on Instrumentation and Measurement


Oscilloscope, channel mismatch, calibration, time-interleaved analog-to-digital converter


Jargon, J. , Cho, C. , Lee, J. , Hale, P. , Jeavons, P. , Schlager, J. and Dienstfrey, A. (2016), Calibration of Time-interleaved Errors in Real-time Digital Oscilloscopes, IEEE Transactions on Instrumentation and Measurement (Accessed March 1, 2024)
Created November 1, 2016, Updated June 2, 2021