A method for autocalibration of the interpolation time interval digitiser with picosecond resolution

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Abstract
A calibration method is described which allows precise determination of the stretch factors of the time stretchers used in the interpolation time interval digitiser with 1 ps incremental resolution. The method is based on analysis of statistical phenomena related to time jitter close to the threshold level of the phase detectors contained in the interpolators. The bias error inherent in the method is analysed and compensation of that error is discussed. A detailed description of a microprocessor procedure to perform automatic calibration is given. The usefulness of the method is proved by numerical examples and experimental results.

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