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引言数字频率合成器采用8039单片微处理机作为控制器件,控制锁相环中的参考输入及锁相环中VCO反馈回去的比相输入,从而得到不同间隔,不同大小的频率输出。由于该仪器采用的锁相环属低频,硬件上限制了上限频率,最高频率只能达到1MHZ左右,频率范围为10HZ—1MHZ,频率间隔为两种,10HZ—100KHZ范围内,频率间隔为10HZ;100KHZ—1MHZ,频率间隔为100HZ。下面以基本原理、硬件、软件结构三部分来阐述。
Introduction The digital frequency synthesizer uses the 8039 single-chip microcomputer as a control device to control the reference input of the phase-locked loop and the phase-contrast input of the VCO fed back to the phase-locked loop to obtain the frequency output with different intervals and different sizes. The phase locked loop used in the instrument is of low frequency, and the upper limit frequency is limited on the hardware. The maximum frequency can only reach about 1MHZ, the frequency range is 10HZ-1MHZ, the frequency interval is two, and the frequency interval is 10HZ in the range of 10HZ-100KHZ. 100KHZ-1MHZ, frequency interval of 100HZ. The following basic principle, hardware, software structure of three parts to elaborate.