CAJ | 학술논문

介绍了一种双通道石英晶体测试系统中信号源的设计方法，整个系统以直接数字频率合成技术为核心，以高稳定度恒温晶振为参考时钟，使用 ARM微控制器实现对信号源的控制。该信号源具有4路输出、输出频率范围宽、频率转换速度快、频率分辨率高的优点，并且可以编程设定振幅、相位等，为石英晶体电参数测量提供了技术支持，提高了石英晶体测量的精度。测量统计结果表明：信号源输出频率精度高于±0.1 ppm，长期频率稳定度高于±0.1 ppm。
개소료일충쌍통도석영정체측시계통중신호원적설계방법，정개계통이직접수자빈솔합성기술위핵심，이고은정도항온정진위삼고시종，사용 ARM미공제기실현대신호원적공제。해신호원구유4로수출、수출빈솔범위관、빈솔전환속도쾌、빈솔분변솔고적우점，병차가이편정설정진폭、상위등，위석영정체전삼수측량제공료기술지지，제고료석영정체측량적정도。측량통계결과표명：신호원수출빈솔정도고우±0.1 ppm，장기빈솔은정도고우±0.1 ppm。
A design method of signal source in the double?channel quartz crystal testing system is introduced in this paper. The DDS (direct digital frequency synthesis) technology is adopted as the core of the whole system,a high?stability constant temperature crystal oscillator is taken as its reference clock,and an ARM micro controller is used to control the signal source. This signal source has the four output channels,wide output frequency range,fast frequency switching speed and high frequen?cy resolution capacity,and can set the amplitude and phase by programming. This design provided technical support for mea?surement of quartz crystal electric parameters,and improved the accuracy of quartz crystal measurement. The measurement and statistical results show that the accuracy of the signal source output frequency is better than ± 0.1 ppm,and long?term frequency stability is better than ± 0.1 ppm.