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The crystal resonator frequency will change according to operating time, this phenomenon is termed as ___________

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The crystal resonator frequency will change according to operating time, this phenomenon is termed as ___________

(a) Magnus effect

(b) Retrace

(c) Aging

(d) Moore’s effect

I got this question in my homework.

Question is taken from Crystal Oscillator-2 topic in portion Oscillators of Analog Circuits

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Right choice is (c) Aging

The best I can explain: Aging is the long term frequency drift of an oscillator. It occurs due to its operation circumstances and duration of power off storage. Contamination of the mass of the crystal affects the aging, as well as excess mechanical stress on the crystal over time.

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