In this paper, a new calculation method for start-up time of crystal oscillators is described. First, the definition and the calculation method mentioned in one of the publications of International Electrotechnical Commission (IEC) are discussed. Then, a new definition suitable for practical circuit design is proposed and a new calculation method for start-up time on a bipolar transistor oscillator with the Colpitts configuration is described. Finally, it is shown that the start-up times of two oscillator circuits with different design policies are calculated and good agreements with experiments are obtained.
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