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