Investigation of excitation circuit influence on crystal oscillator F-T curve local disturbances

This article is devoted to investigation and simulation of oscillator circuit influence on frequency jumps and F-T curve irregularity. Till now the influence of parasitic resonator modes on oscillator frequency was considered only empirically and was not linked with properties of the resonator excitation circuit. However it is possible to show, that magnitudes of local perturbations and the fact of appearance of oscillator F-T curve hysteresis are depend on a type oscillator circuit and on values of its elements. In the represented article the mathematical model of the given phenomenon is offered. The analysis of conditions that lead to stimulation of frequency jumps or shifts by the oscillator circuit is provided. The technique of computer simulation of F-T curve irregularity is offered. The results of F-T curve irregularity simulation for various combinations of resonator and oscillator, recommendation influencing on choice of the oscillation circuit and outcomes of comparisons with experimental data are presented