Invariant Two-frequency Quartz Oscillators Based on Dual-loop Automatic Frequency Control Systems

The paper represents development of functional and algorithmic approach to provide technical invariance of quartz crystal oscillators in multi-frequency excitation mode. Building invariant quartz crystal oscillators on the base of dual-loop automatic frequency control systems is considered. The models for technically invariant quartz crystal oscillators on the base of frequency and phase adjustment systems are represented. The offered approach allows eliminating contradiction between invariance and stability of generated oscillations in multi-frequency excitation mode of the quartz resonator.