Abstract. A method is proposed for constructing private Comparators using time-to-digital converters to esti-mate the dispersion of Allan frequency, as one of the most important parameters of the onboard clock of the spacecraft. It is shown that the Application of integrated time-to-digital converters is shown to be a promising direction of development of the theory of synthesis of frequency Comparators. The main sources of error in the estimation of the mean square relative two-sample frequency deviation are identified: quantization noise, differential nonlinearity, and temperature fluctuations of the full scale error. A structural scheme of the PDA Converter with reduced sensitivity to the nonlinearity of the time discriminator is developed. Computational experiment confirmes the correctness of the results.

Keywords: time-to-digital converter, frequency stability, autocalibration, correlated double sampling, oversampling

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