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

Published

November 1, 2016

Author(s)

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

Abstract

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.

Citation

IEEE Transactions on Instrumentation and Measurement

Pub Type

Journals

Keywords

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

Citation

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 October 24, 2025)