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Time caliper method with enhanced accuracy using an arbitrary waveform generator and time demultiplexer with fine

H-T Luk, L-K Chen

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    This study introduces an improved time caliper method for precise signal delay measurement. The new technique significantly enhances accuracy by generating pulse trains with a much smaller period difference, enabling sub-picosecond resolution.

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    Area of Science:

    • Electrical Engineering
    • Signal Processing
    • Metrology

    Background:

    • Accurate measurement of small relative delays between signals is crucial in various fields.
    • Existing time caliper methods face limitations in achieving high precision for sub-picosecond delay measurements.

    Purpose of the Study:

    • To propose an improved time caliper method for enhanced measurement of small relative signal delays.
    • To achieve a significantly smaller period difference between generated pulse trains compared to prior methods.

    Main Methods:

    • Generation of two periodic pulse trains with a period difference of 0.1 ps using an arbitrary waveform generator and a time demultiplexer.
    • Implementation of a fine clock offset to control the period difference.
    • Application of the improved time caliper technique for delay measurement.

    Main Results:

    • Achieved a period difference over 1000 times smaller than previous schemes.
    • Obtained average and maximum measurement errors of 0.68 ps and 1.67 ps, respectively.
    • Demonstrated a significant improvement in the precision of relative delay measurements.

    Conclusions:

    • The proposed improved time caliper method offers superior accuracy for measuring small relative signal delays.
    • The novel pulse train generation technique is key to achieving sub-picosecond measurement resolution.
    • This advancement has potential applications in high-precision timing and signal analysis.