高安定水晶発振回路における長期周波数安定度劣化要因に関する実験的検討

抄録

To analyze the long-term frequency stability of ultra-stable quartz crystal oscillators, a novel system that continuously measures the stability in both resonant frequencies of the resonators and oscillation frequencies has been proposed. This system enables to estimate the influence of the active circuit conditions upon the resonator aging, and to evaluate the long-term oscillation frequency drift caused by the circuit parts aging. Experimental results using an SC-cut resonator and two distinct Colpitts oscillators show that the long-term resonant frequency drift mainly depends on the amplitude of the crystal driving current and that the aging of the circuit parts affects the long-term frequency stability.