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由于石英晶体的振动频率和稳定度都很高,所以它在射频(RF)振荡和滤波器电路中得到了广泛的应用。图示的电路是一种晶体试验电路,用它可检测晶体能否工作的基本状态。 该电路采用考比兹(Colpitt)晶体振荡电中,其中供振荡的反馈信号取自三极管的发射极而不是基极上,这种反馈信号方式可使振荡器的谐振频率大大提高。该试验器不仅可检测试验晶体振动的基频,而且还可检测试验晶体的谐波频率(常称泛音,比基频更高的频率,常用3、5、7次泛音——译注)。电路工作是,进把
Due to the high vibrational frequency and stability of quartz crystal, it has been widely used in RF oscillation and filter circuits. The circuit shown is a crystal test circuit that can be used to detect the basic status of the crystal can work. The circuit uses a Colpitt crystal oscillator in which the feedback signal for oscillation is taken from the emitter rather than the base of the transistor. This feedback signal greatly increases the resonant frequency of the oscillator. The tester can not only detect the fundamental frequency of the test crystal vibration, but also test the harmonic frequency of the crystal (often referred to overtone, higher frequency than the fundamental frequency, commonly used 3,5,7 overtones - Annotation). Circuit work is, into the handle