很多测试和设计功能要求采用频率精度优异的正弦波信号源.虽然信号发生器可在初始设计阶段用于精确的正弦波信号源,但是,它们的价格太贵,不能满足生产测试功能要求.一种选择方案就是设计正弦波晶体振荡器.但是,其代价可能太高,因为设计任务既有困难,又有风险.另一种选择方案(参见附图)可以在固定频率应用中取代信号发生器.通 Many test and design functions require the use of sinusoidal signal sources of excellent frequency accuracy, although signal generators can be used in the initial design phase for accurate sine wave signal sources, but they are too expensive to meet manufacturing test requirements. The choice is to design a sine-wave crystal oscillator, but at a price that is too high because of the design challenges, which are both difficult and at risk. An alternative (see the figure) replaces the signal generator in fixed-frequency applications .through