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Calibration of Time-Interleaved Errors in Digital Real-Time Oscilloscopes.

Chihyun Cho1, Joo Gwang Lee1, Paul D Hale2

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Summary

A new calibration method for time-interleaved digital real-time oscilloscopes (DRTOs) uses linear equations to correct channel mismatches in time-interleaved analog-to-digital converters (TIADCs). This approach simplifies calibration and improves accuracy by avoiding extra filters.

Keywords:
Channel mismatchdigital oscilloscopedigital real-time oscilloscope (DRTO)real-time oscilloscopetime-interleaved analog-to-digital converters (TIADCs)time-interleaving error

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Measurement Science

Background:

  • Time-interleaved analog-to-digital converters (TIADCs) are crucial for high-speed digital real-time oscilloscopes (DRTOs).
  • Channel mismatch errors in TIADCs degrade measurement accuracy.
  • Existing calibration methods often rely on complex additional filtering stages.

Purpose of the Study:

  • To propose a novel channel mismatch calibration method for DRTO applications.
  • To develop a calibration technique that simplifies error correction in TIADCs.
  • To enhance the accuracy and efficiency of DRTO measurements.

Main Methods:

  • Derivation of linear equations using Fourier transforms of separated signals from TIADCs.
  • Calibration of TIADC errors through matrix inversion.
  • Development of a transfer function measurement method for commercial DRTOs.

Main Results:

  • The proposed method calibrates TIADC errors effectively via matrix inversion, eliminating the need for additional filters.
  • Calibration accuracy is primarily limited by post-TIADC noise, outperforming filter-dependent methods.
  • Validation using two-tone signals on commercial DRTOs demonstrated a significant reduction in spurious frequencies.

Conclusions:

  • The proposed matrix inversion method offers a simpler and more accurate approach to channel mismatch calibration in DRTOs.
  • This technique enhances the performance of TIADCs by minimizing calibration-induced errors.
  • The transfer function measurement method is suitable for practical application in commercially available DRTOs.