基于单片机的智能可调低频脉冲信号源的研制

目的：研制能够输出频率、占空比和幅值独立可调的低频脉冲信号源发生器。方法：采用STC89C52单片机系统产生低频脉冲信号。应用D／A转换器DAC0832将单片机产生的数字信号转换为模拟信号，最终进行滤波和预放大。该输出信号的频率、占空比和幅度可通过程序和按键控制调节，输出信号参数可通过LCD1602液晶进行实时显示。结果：采用TEKTRONIX示波器对输出信号进行检测，该信号源输出脉冲信号频率可调范围为0—2kHz、步进为0．5Hz，占空比可调范围为10％～80％，输出电压峰值为0—5v。结论：该智能低频脉冲信号源结构紧凑、灵活可控，能够保证输出低频脉冲信号准确可靠。

Development of intelligent adjustable low frequency pulsed signals generator based on single chip

Objective To design and complete low frequency pulsed signal generator with the frequency, duty cycle and amplitude independently adjustable. Methods The single chip system was designed to generate low frequency pulsed signals, and then the digital signals were converted into analogy signals through DAC0832 chip. Finally the analogy pulsed signals were filtered and amplified. The frequency, duty cycle and amplitude of the output pulsed signals could be adjusted by button. In addition, the parameters of the output signals could be displayed in real time by LCD1602 liquid crystal screen. Results The results of measurement of TEKTRONIX oscilloscope showed that the signals generator could output satisfied signals with frequency range between 0 and 2 kHz, stepped by 0.5 Hz, duty cycle range from 10% to 80%, voltage range from 0 to 5 V. Conclusion The intelligent low frequency pulsed signals generator features compact structure, easy operation, especially can ensure the high precision and reliability of output signals.