METHOD OF INTEGRATING QUARTZ CRYSTAL OSCILLATOR INTO SYNCHRONISATION DEVICE AND SYNCHRONISATION DEVICE ENABLING REDUCTION OF REQUIREMENTS FOR SAID OSCILLATOR Russian patent published in 2010 - IPC H03L7/06 

FIELD: physics; communication.

SUBSTANCE: invention is meant for making highly stable sources of reference oscillations based on quartz crystal oscillators and for use in communication systems, in measuring devices and as a stand-alone source of electric oscillations at standard frequency. The method of integrating a quartz crystal oscillator into a synchronisation device is realised by shifting the oscillation spectrum of the quartz crystal oscillator in the frequency range of the spectrum of input synchronisation signals and comparing their phase with the phase input synchronisation signals, the measured phase difference is averaged over a standard time interval, summed with temperature compensation signals of the quartz crystal oscillator, compensation for temperature hysteresis of the quartz crystal oscillator, compensation for ageing of the quartz crystal oscillator, and the obtained signal is used as control input for adjusting frequency of the quartz crystal oscillator. In the absence of external synchronisation oscillations, the quartz crystal oscillator is tuned using modules for recording oscillation frequency drift of the quartz crystal oscillator due to ageing, temperature changes and temperature hysteresis, which, combined with a built-in thermostat of the generator, enables to maintain high stability of frequency of output oscillations of the generator in for a long time interval, preserving operating capacity of the device as a whole. The device has a satellite navigation system signal receiver which has a time mark output, connected to the first input of a phase detector. The second input of the phase detector is connected to the output of a frequency divider. The output of the phase detector is connected to the input of a storage device with memory. The output of the storage device with memory is connected to the first input of an adder. The output of the adder is connected to the input for adjusting the quartz crystal oscillator. The capturing output of the satellite navigation system signal receiver is connected to the control input of the storage device with memory and to the module for compensating for frequency drift of the quartz crystal oscillator due to ageing. The second input of the adder receives a signal from the module for compensating for frequency drift of the quartz crystal oscillator due to temperature instability and temperature hysteresis. The input of the module for compensating for frequency drift due to temperature and temperature hysteresis is connected to a temperature sensor. The output of the quartz crystal oscillator is connected to buffer amplifiers. The output of one of the buffer amplifiers is used for transmitting oscillations at reference frequency to external devices, the output of the other - for transmitting oscillations at reference frequency to clocked device modules (to a microcontroller). Outputs of the modules for compensating for frequency drift due to temperature and temperature hysteresis, and the module for compensating for frequency drift due ageing are connected to corresponding adder inputs. The output of the storage device with memory is additionally connected to the input of the module for compensating for frequency drift due to ageing.

EFFECT: increased stability of oscillation frequency of a quartz crystal oscillator for a long period of time without an external synchronisation signal.

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