Automated calibration technique for programmable Universal Frequency-to-Digital Converter

The automated calibration technique for a trimming inaccuracy (calibrationtolerance) of quartz resonator using in the universal precision frequency-to-digital converter is described in the paper. It was shown that such technique can be used also for reducing an error due to a quartz crystal aging and a temperature drift. The experimental technique and results for converter's error research in the temperature range -40…+85 °C is also described in the paper. The aim of these experiments was to detennine the margins of temperature range outside of which it is necessary to use the correction of frequency instability due to tcmperature changes.