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以前大家认为,分析晶体振荡电路的激励信号电平特性是相当困难的。一般说来,往往采用把晶体振子与容性负阻有源电路相接的方法使晶体振荡电路振荡。如果在晶体振子的端点把晶体振荡电路分离成振子和有源电路,先单独求出有源电路的特性,就可以求出连接任意振子时的振荡特性。本文根据上述设想研究了采用通用电路分析程序来分析晶体振荡电路特性的方法。现在我们对10～30兆赫的频率范围内实用的非调整科耳皮兹晶体振荡电路作了分析并与测量值作了比较,具体分析了振荡电路的负阻、等效电容和振子的激励电流,所得到的结果与测量值十分相符。另外,对设计时就予以重视的振荡频率与电源电压的依赖关系也作了分析,已经做到可以分析百万分之几的量级的频率变化,所得到的结果与测量值十分相符。可以认为,本文所采用的方法对于改进振荡电路的设计是有用的。
In the past we believe that the analysis of crystal oscillator circuit excitation signal level characteristics is quite difficult. In general, the crystal oscillator is often used to oscillate the crystal oscillation circuit by connecting the crystal oscillator to the capacitive negative resistance active circuit. When the crystal oscillation circuit is separated into the oscillator and the active circuit at the end of the crystal oscillator, the oscillation characteristics at the time of connecting arbitrary oscillators can be obtained by first determining the characteristics of the active circuit. Based on the above assumptions, this paper studies the method of using general circuit analysis program to analyze the characteristics of crystal oscillators. Now we analyze the practical non-adjusted Cooperz crystal oscillation circuit in the frequency range from 10 to 30 MHz and compare it with the measured values. We analyze the negative resistance, the equivalent capacitance and the excitation current of the oscillator , The results obtained are in good agreement with the measured values. In addition, the design-time emphasis on the oscillation frequency and supply voltage dependence has also been analyzed, it has been possible to analyze the order of a few millionths of the frequency changes, the results obtained are in good agreement with the measured values. It can be considered that the method used in this paper is useful for improving the design of the oscillation circuit.