Khoptinskiy R. Invariant multifrequency piezoresonant devices with digital compensation of regime instability of quartz oscillator

The thesis is devoted to the questions of providing technical invariance of piezoresonant devices as to the destabilized influences by means of compensation of parametric non-stationary quartz oscillator in the regime of multi-frequent excitation. The research proposes the use of external-capacitive control of regime of excitation of multi-frequency quartz oscillator with the use of discrete capacitor in the form of matrix micro-electromechanical (MEMS) structures with two-level combined digital control. The methods of analysis of complex multi-frequent piezoresonance oscillation system (MPOS) with MEMS control are worked out. Within the worked out methods the mathematical model of piezo-oscillating system based on expanded equivalent scheme of MPOS with external affiliated elements is built and the basic parameters of characteristics of MPOS control in three-frequency regime of oscillation are defined. The imitation model of quadrature signals demodulator, which takes into account the instability of formation of frequencies of supporting quadrature oscillations because of the work of temperature and vibration-mechanical destabilizing factors. The analysis of influence of destabilizing factors onto the errors of demodulation of quadrature signals taking into account the noiseproof cascade coding signals are done. The research investigates and proposes the structure model of digital synthesizer of frequency of direct synthesis with the circles of temperature and vibration compensation, which provides depending on the type of quartz resonator the decrease of temperature sensitivity up to 10…15 times, the vibration sensitivity up to 5..8 times in comparison with the analogs. The questions of realization of quadrature demodulators of digital signals of satellite systems of information transfer are reviewed.